Apple's digital assistant is called Siri. Launched with the iPhone 4S, Siri utilizes natural language processing to respond to voice commands, allowing users to perform tasks like sending messages, setting reminders, and controlling smart home devices. Siri’s integration with Apple's ecosystem enhances its functionality, making it a central feature of iOS and macOS. Over the years, it has evolved, incorporating machine learning techniques to provide more personalized and context-aware assistance.