A charger is a device used to supply electrical energy to recharge batteries. It converts alternating current (AC) from a power source into direct current (DC) suitable for charging various types of batteries, including those found in smartphones, laptops, and electric vehicles. Chargers come in different shapes and sizes, depending on their intended use and the type of battery they are designed to charge. There are several types of chargers, including wall chargers, car chargers, and wireless chargers. Wall chargers plug directly into an electrical outlet, while car chargers connect to a vehicle's power supply. Wireless chargers use electromagnetic fields to transfer energy without physical connections, making them convenient for devices like smartphones and smartwatches.