The Apple Watch Series 10 features a larger, brighter, edge-to-edge Always-On Retina display, a thinner and lighter design, and faster charging that reaches 80% in about 30 minutes. It includes advanced health and safety features like an ECG app, Cycle Tracking, sleep apnea notifications, and fall/crash detection, as well as enhanced aquatic features with a depth gauge and water temperature sensor. It runs on watchOS 11 and is compatible with iPhones, with a WR50 water resistance rating.