Sleep mode is a power-saving feature found in many electronic devices, such as computers, tablets, and smartphones. When activated, it reduces the device's energy consumption by turning off the display and slowing down background processes while keeping the system in a low-power state. This allows users to quickly resume their work without fully shutting down the device. In sleep mode, the device retains its current state, including open applications and documents. This means that when the user wakes the device, it can return to its previous activity almost instantly, making it a convenient option for short breaks or when the device is not in use for a while.