A portable charger, also known as a power bank, is a compact device designed to store electrical energy. It allows users to recharge their electronic devices, such as smartphones, tablets, and laptops, while on the go. These chargers come in various sizes and capacities, enabling them to provide multiple charges depending on the device's battery size. Most portable chargers connect to devices via a USB cable, making them compatible with a wide range of electronics. They are especially useful during travel, outdoor activities, or emergencies when access to a power outlet is limited. Many models also feature built-in safety mechanisms to prevent overcharging and overheating.