Charging devices are tools used to replenish the battery power of electronic gadgets like smartphones, tablets, and laptops. They convert electrical energy from a power source, such as a wall outlet or a USB port, into a form that can be stored in a device's battery. Common types of charging devices include wall chargers, car chargers, and portable power banks. Most charging devices come with specific connectors, such as USB-C, Lightning, or Micro-USB, to fit different devices. The charging speed can vary based on the device and charger specifications, with some supporting fast charging technologies that allow for quicker power replenishment.