A power bank is a portable device that stores electrical energy, allowing you to charge your electronic gadgets like smartphones, tablets, and even some laptops on the go. They come in various sizes and capacities, making it easy to find one that suits your needs. Most power banks have multiple USB ports, so you can charge more than one device at a time. Using a power bank is simple: just connect your device to the power bank using a charging cable. Once charged, you can unplug and use your device without worrying about finding an outlet. This makes power banks especially useful during travel or outdoor activities where access to electricity is limited.