A smartphone charger is a device used to supply electrical power to a smartphone, allowing it to recharge its battery. Most chargers consist of a power adapter that plugs into a wall outlet and a cable that connects to the smartphone. The charger converts electrical energy from the outlet into a form that the smartphone can use. There are various types of smartphone chargers, including USB chargers, wireless chargers, and fast chargers. Each type has its own advantages, such as convenience or speed of charging. Many smartphones come with a compatible charger, but users can also purchase third-party options to suit their needs.