Doze Mode is a power-saving feature found in Android devices that helps extend battery life when the device is not in use. When activated, it reduces background activity, limits app updates, and restricts notifications, allowing the device to conserve energy while remaining idle. This mode activates automatically when the device is stationary and the screen is off for a certain period. Users can still receive important notifications from selected apps, ensuring that essential information is not missed while the device is in a low-power state.