Siri is an intelligent personal assistant developed by Apple Inc. and available as a built-in app on iOS devices. It uses natural language processing to understand and respond to user commands. Siri can be used to send messages, make phone calls, search the web, set reminders, play music, and more. It is powered by a voice-recognition system that can interpret a wide range of commands and queries. Siri is designed to make it easier for users to interact with their devices, and its advanced artificial intelligence capabilities help it anticipate user needs and offer personalized suggestions.
Google Assistant is open source, unlike Siri, Google Assistant has more features and can remember conversations. Here is an example: "Who is Steve Jobs?" [ASSISTANT ANSWER] "When did he die?" [ASSISTANT ANSWER].