A power bank is a portable device that serves as an external battery, allowing users to charge their electronic devices on the go. These compact gadgets come in various sizes and capacities, providing backup power for smartphones, tablets, laptops, and other USB-powered devices. Power bank typically feature one or more USB ports for connecting charging cables and can be recharged themselves via USB or other power sources. With the increasing reliance on mobile devices in everyday life, power banks have become essential accessories for travelers, outdoor enthusiasts, and anyone in need of reliable backup power to stay connected and powered up throughout the day.