A factory reset is a process that restores a device, such as a smartphone or computer, to its original system settings. This means all personal data, apps, and custom settings are erased, returning the device to the state it was in when first purchased. It is often used to troubleshoot issues or prepare a device for a new user. Before performing a factory reset, it is important to back up any important data, as this process cannot be undone. Users can typically find the factory reset option in the settings menu of their device, often under sections like System or Backup & Reset.