A wall charger is a device used to supply electrical power to charge electronic gadgets like smartphones, tablets, and laptops. It typically plugs directly into a wall outlet and converts the electrical energy from the outlet into a form that can be used to recharge batteries in these devices. Most wall chargers come with a USB port or a specific connector that matches the device being charged. They vary in power output, which affects how quickly a device can charge. Some wall chargers are designed for fast charging, while others provide a standard charging speed.