Wireless chargers are devices that use electromagnetic induction to charge batteries in portable devices, such as smartphones, without the need for a physical connection. They typically consist of a charging pad or stand that the device is placed on, and a power adapter that connects the charging pad to an electrical outlet. Once the device is placed on the charging pad, the charger uses an electromagnetic field to transfer energy from the pad to the device, charging the battery. Some newer smartphones and devices have built-in wireless charging capabilities, while others may require a separate wireless charging case or adapter to be used with the charging pad.