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Siri is a powerful virtual assistant developed by Apple, deeply integrated across its ecosystem. It allows users to interact with their devices using voice commands to perform a wide range of tasks, from sending messages and setting reminders to searching the web and controlling smart home devices.
Google Now was a proactive smart assistant designed to provide users with timely information based on their routines and searches. It anticipated needs and presented relevant 'cards' without direct user queries, leveraging Google's vast data ecosystem.