Chargers are devices that supply electrical power to recharge batteries in various gadgets. They come in different shapes and sizes, designed for specific devices like smartphones, laptops, and tablets. For example, a smartphone charger typically has a USB connector that plugs into the phone, allowing it to draw power from a wall outlet or a power bank. In addition to standard chargers, there are also wireless chargers that use electromagnetic fields to transfer energy without needing a physical connection. This technology is becoming popular for its convenience, allowing users to simply place their devices on a charging pad to power them up.