The Apple Watch is a smartwatch developed by Apple that incorporates fitness tracking and health capabilities and integrates with iOS devices. It uses the S1 system-on-chip and taps an engine for haptic feedback. WatchOS runs on the Apple Watch with circular icons and can be navigated via touchscreen or digital crown. While it offers transitions between watch and phone in different sizes, it has drawbacks of long wait times, high costs, and dependency on the iPhone with a small screen.