A USB charger is a device used to supply electrical power to various electronic gadgets, such as smartphones, tablets, and portable speakers. It typically connects to a power source, like a wall outlet or a computer, through a USB (Universal Serial Bus) cable. The charger converts the electrical current to a suitable voltage for the device being charged. USB chargers come in various forms, including wall adapters, car chargers, and power banks. They often have multiple ports, allowing users to charge several devices simultaneously. Many modern chargers support fast charging, which enables quicker power replenishment for compatible devices.