What is what does flashable mean?

Flashable refers to a software or firmware update that can be installed or updated onto a device using flashing tools or software. The term "flash" refers to the process of overwriting the current firmware on a device with a new firmware. Flashable updates can be provided by the device manufacturer or developed by third-party developers. These updates are often used to improve the performance of a device, fix bugs or security issues, or add new features or functionalities. Flashable updates may also be used to install custom ROM on Android devices.