A smartphone charger is a device used to supply electrical power to a smartphone, allowing it to recharge its battery. It typically consists of a power adapter that plugs into a wall outlet and a cable that connects to the smartphone. Chargers come in various types, including wired and wireless options, and are designed to deliver the appropriate voltage and current for safe charging. Most smartphones use a standard charging port, such as USB-C or Lightning, to connect with the charger. Some chargers support fast charging, which enables quicker battery replenishment. It's important to use a compatible charger to ensure optimal performance and avoid damaging the device.