Power Bank

A power bank is a portable electronic device that is used to charge other devices such as smartphones, tablets, and laptops. It is essentially a battery pack that can store electrical energy and then release it to charge other devices via a USB cable.
Power banks typically come in various capacities, which determine how much charge they can hold and how many times they can charge a device. They are usually charged using a wall charger or USB port on a computer, and then can be carried around to provide extra power when needed.
Power banks are particularly useful for people who are on the go and cannot access a power outlet. They are also helpful in situations where there is a power outage or when travelling to remote areas where electricity is not readily available.