Flashing refers to the process of updating or replacing the firmware or software on a device, such as a smartphone or computer. This is often done to improve performance, fix bugs, or add new features. The process typically involves downloading the new software and using specific tools to install it on the device. In the context of mobile devices, flashing can also mean installing a custom operating system, like Android ROMs, which allows users to personalize their devices beyond the manufacturer's limitations. However, flashing can void warranties and may lead to issues if not done correctly, so caution is advised.