Smartphone charging refers to the process of replenishing the battery power of a smartphone. This is typically done using a charger that connects to a power source, such as a wall outlet or a USB port on a computer. Most smartphones use lithium-ion batteries, which can be charged quickly and efficiently. There are various charging methods, including wired and wireless options. Wired charging involves plugging a cable into the smartphone, while wireless charging uses electromagnetic fields to transfer energy. Fast charging technology allows for quicker battery replenishment, making it convenient for users on the go.