A charger is a device used to supply electrical energy to recharge batteries. It converts electrical power from an outlet into a suitable form for the battery, ensuring it can store energy for later use. Chargers are commonly used for various devices, including smartphones, laptops, and electric vehicles. There are different types of chargers, such as wall chargers, car chargers, and wireless chargers. Each type is designed for specific applications and may vary in speed and efficiency. For example, a wall charger typically provides faster charging than a car charger, while a wireless charger offers convenience without the need for cables.