A power bank is a portable device that allows you to charge your electronic devices on the go. It typically consists of a rechargeable battery with multiple output ports to charge various gadgets such as smartphones, tablets, and other USB-powered devices. The device is designed for convenience, enabling users to maintain their device's battery life while traveling or during outdoor activities. Power banks come in various sizes and capacities, usually measured in milliampere-hours (mAh), indicating how much power they can store. Many power banks are equipped with features like fast charging, LED indicators, and built-in safety mechanisms to prevent overcharging and overheating.