Siri is Apple's smart assistant across all of its platforms. It uses machine learning to determine suggestions for users, answer queries, or control devices. Users can configure it to speak with multiple voices across several languages.

● Voice activated digital assistant
● Shortcuts for automation
● Personalized with machine learning
● Private and secure
● Speaks and understands 20 languages
● Translate conversations
● Available in over 30 countries
● Introduced in 2011

Page last updated:

Get Apple News Directly in Your Inbox

AppleInsider is supported by its audience and may earn commission as an Amazon Associate and affiliate partner on qualifying purchases. These affiliate partnerships do not influence our editorial content.

Apple's smart assistant launched nearly a decade ago and has evolved tremendously during that time. Siri can sound natural, respond to queries conversationally, remember previous conversations, and control aspects of your life, all while remaining private and secure.

Siri Features

Siri is an umbrella name for the smart voice assistant built into nearly every device in the Apple ecosystem. It also includes all the technologies surrounding machine learning and on-device intelligence used for smart suggestions.

Unlike other smart assistants, Siri doesn't have a central hub or speaker to call home. The HomePod mini is the closest thing to a "Siri device" that Apple sells, though it isn't advertised that way.

Siri could one day adjust its volume and pitch based on environmental conditions Siri could one day adjust its volume and pitch based on environmental conditions

Apple acquired the original voice assistant from SRI, a research company that had an app of the same name in the App Store. Soon after, Apple integrated Siri into iOS to release alongside the iPhone 4S.

At its start, Siri was barely a task manager capable of responding to simple commands. Apple has slowly added features and improved upon Siri's intelligence while trying to keep up with the competition.

How Siri Works

With a tap, press, or wake command, Apple's smart assistant is easily activated across all Apple devices. The universal wake word "Hey Siri" allows you to make commands or queries from nearly any Apple device. 

When speaking, your command is processed locally to determine if it can be done on the device. If not, it is sent to an Apple server with a random identifier. All voice data is encrypted end-to-end so all data is synced without fear of snooping from Apple or anyone else that may try to look.

Siri intelligence uses machine learning for various tasks. It can find and suggest calendar appointments in email or messages, suggest web pages in Safari from links in iMessage, and offer smart text suggestions based on recent websites or news articles the user interacted with. It will also recommend tasks you perform frequently or during specific times of day.

Apple HomePod iOS 13 brought multi-user support to HomePod

Third-party developers can tap into Apple APIs and create their own integrated functions. Devices like the HomePod, now discontinued, was heavily scrutinized by regulators who thought Apple gave too much preference to its own services. Now, companies can utilize APIs to add services like Spotify to the HomePod.


As you use Siri on various Apple products, the smart assistant will use what it has learned to grow more personalized. In essence, each user's Siri is unique to them.

There are also multiple voices to choose from to further customize Siri. Apple introduced two new English voices for a total of four in iOS 14.5. This version also removed gender identification from the voices for better social inclusion.

Siri doesn't have a gender, so its voices don't have one either Siri doesn't have a gender, so its voices don't have one either

Other than the suggestions that occur across your device, you can also create custom actions called Shortcuts. As of iOS 13, Shortcuts are built into the system, allowing even casuals users to create quick interactions with their phones. Siri Intelligence and the voice assistant both play a part in this.

Further customization can take place within Apple apps or inside the voice assistant itself. You can tell Siri which of your contacts are family members, how to spell and pronounce certain names or words, and set a nickname that it will use for you in conversation.

Privacy and Security

As with everything Apple does, the company built Siri and its systems with privacy and security in mind. The Secure Element found in Apple's processors stores encrypted personal data on the device. It only sends complex actions or questions to servers for parsing using a random identifier. From settings, you can delete and reset this identifier and all personalization and data at any time.

Sending an audio message or dictating text is now entirely done on device Sending an audio message or dictating text is now entirely done on-device

As of iOS 14, all text-to-speech recognition will take place on-device using the Neural engine. This means that features like dictation will take place locally without being sent off to a server for processing.

There was some concern over how voice data was being used by Apple, so the company introduced the ability for users to turn off certain diagnostic tools. Previously, recordings were sent to Apple for accuracy analysis, but now this is an opt-in only feature and transcriptions of interactions are used instead.


Shortcuts has new colors, icons, actions, and folders in iOS 14 Shortcuts have new colors, icons, actions, and folders in iOS 14

Shortcuts is the next stage of Workflow, a third-party iOS app that used available APIs to allow users to create on-device automation. Apple purchased Workflow to lay the groundwork for Shortcuts.

At first, Apple distinguished manually controlled Shortcuts from voice activated "Siri Shortcuts." A third category of Shortcuts was also used for Shortcuts that had been suggested by third-party apps.

Later, the different types of Shortcuts were combined into one format to reduce confusion. Now, all Shortcuts can be used via Siri by saying the Shortcut name as the command.

Apple updated several aspects of Shortcuts with iOS 14. Automations can run without user interaction, Shortcuts placed on the Home Screen no longer launch the Shortcuts app, and the Shortcuts app has folders for sorting Shortcuts.


The new Translate app will translate between languages offline using Siri intelligence The new Translate app will translate between languages offline using Siri intelligence

The Translate app in iOS 14 lets Siri translate conversations in real-time. The app intelligently understands what language the speaker is using and translates it on the fly.

When held in landscape mode, Translate displays the conversation in both languages on either side of the screen, so each person can see translations easily.

The Translate app works entirely offline and features two-way translation for the following languages:

  • English
  • Mandarin Chinese
  • French
  • German
  • Spanish
  • Italian
  • Japanese
  • Korean
  • Arabic
  • Portuguese
  • Russian

Devices with Siri

Siri launched as an exclusive iPhone feature, starting with the iPhone 4s. The feature has since spread to every part of the Apple ecosystem. The following examples illustrate where Siri is and how users can implement it.

iPhone, iPad, and iPod touch

"Hey Siri" will wake any modern Apple device, triggering listening for a query. You can also summon Siri by holding down the home button on Touch ID devices or the side button on Face ID devices.

The iPhone can learn to listen only for your voice, reducing accidental activations from commercials or other users.

Apple Watch

If a user's Apple Watch is awake with the screen fully on, speaking "Hey Siri" will activate voice commands on the watch.

Apple's wearable also includes a feature called "Raise to Speak." It allows you to raise your watch to your mouth and speak a command without saying the wake phrase. The feature first appeared on the Apple Watch Series 3.

Apple WatchSiri's watch face gives you relevant information throughout the day

When held, the Digital Crown will summon the assistant as well. This is a foolproof way of getting Siri's attention without the need of using a wake word or hand gesture. Users can disable this method if inadvertent activations are frequent.

The Apple Watch also has a dedicated Siri watch face, although Apple hasn't updated it much since release.

Airpods and Beats Pro 

Second-generation AirPods, AirPods Pro, AirPods MaxPowerbeats Pro, and Solo Pro all offer "Hey Siri" functionality. First-generation Airpods can summon Siri with a double-tap gesture.

Devices with the H1 processor will read your incoming messages using "announce messages with Siri." Users can reply to these messages without saying the wake word.

When Siri is used by headphones of any kind, it is being controlled by the connected iPhone or iPad rather than relying on an integrated headphone-based Siri.

Headphones, Headsets, and CarPlay

Some devices with built-in mics connected over Bluetooth, Lightning cable, or audio jack will work with Siri. On compatible devices, you can press and hold on the play/pause button or call button to summon Apple's assistant.

Apple CarPlay Siri in your car will help keep your eyes on the road

CarPlay functionality depends on the car's hardware. Usually, it will allow "Hey Siri" or a long press on the touchscreen home button or steering wheel call button to summon the assistant.

Using the assistant in the car allows for safe hands-free controls like making a call or getting directions. Interactions via CarPlay limit the interactions to voice-only so the driver isn't distracted.

Apple TV

Siri on the Apple TV has limited functionality. To use the assistant on Apple TV, hold down the Siri button on the Siri Remote. You can request movie or music playback, search for movies using universal search, ask some trivia questions, or control your home. When viewing media, you can ask "who is in this movie" or "what did they say" to get specific results designed for the Apple TV.

HomePod and HomePod mini

Siri is the primary user interface with HomePod. You can summon the assistant with "Hey Siri" or by long-pressing the glass surface on the HomePod's top.

Apple refers to Siri on the HomePod as a personal Music expert, offering other functions unique to the HomePod. These include describing who an artist is rather than showing a page result when asked about an artist.


On Mac, you can activate Siri via a dedicated Siri button. You can find this in the Touch Bar on any MacBook with Touch Bar or the menu bar. You can also trigger the assistant with a keyboard shortcut.

"Hey Siri" works on Macs with built-in mics and T2 chips made after 2018. This version is also limited, only recently gaining the ability to control HomeKit.

Apple, Siri, and Social Awareness

Siri resides on every iOS device and nearly every Mac, making the assistant a primary source of information for many users. Apple claims millions of users activate it every day, and the company wants to keep Siri relevant and learning.

Apple tends to release statements during significant national events and social movements, and Siri technology sometimes participates as well. Large events like elections or acts of terrorism spurred Apple into adding special Siri queries. In these situations, the company wants to keep the public informed beyond merely presenting a Wikipedia page.

In 2020, Apple made Siri smarter about the events surrounding the election, providing users with helpful information about each state's primaries and caucuses. The assistant would often read an answer aloud and show a link to special Apple News coverage.

As 2020's unprecedented events proceeded, Apple adapted its digital assistant accordingly. The spread of coronavirus sparked fear and doubt, and Apple again wanted its smart assistant to be a useful tool. Apple gave Siri specific answers to questions about COVID-19 and offered links to the CDC and Maps directions to testing centers.

When the George Floyd protests broke out, demand for fact-checked information came with it. As misinformation spread, Apple gave Siri an update to push people towards facts and appropriate context. If users asked about "All Lives Matter," Siri would respond by showing users a link to the Black Lives Matter page.

Apple updated Siri on a beta version of iOS 14.5 with new English speaking voices, but more importantly, the update removed gender identifiers from the voices. Users will also be given a choice at setup rather than defaulting to a specific voice sound. These announcements were made on the International Transgender Day of Visibility.

The Future of Siri

Apple discontinued the HomePod in 2021 without a replacement device at the ready. Some fear that Apple will step away from the smart assistant race and abandon the smart speaker market altogether. Those fears are unfounded, however, as the HomePod mini is still for sale and new features are being developed and released regularly.

Apple could introduce a home device for Siri. A HomePod replacement with a screen that acts as the central computer of the smart home.

Apple is investigating using environmental cues and user voice tone to adjust Siri responses. Users could whisper and get a quiet response, or yell over a loud environment to get a loud response back.

Keep up with all the Apple news with your iPhone, iPad, or Mac. Say, "Hey, Siri, play AppleInsider Daily," – or bookmark this link – and you'll get a fast update direct from the AppleInsider team.


Siri Related Stories