What is the difference between the legendary fat girl plug-in and the script?

The difference between the legendary fat girl plug-in and the script. Scripts are built-in commands in programs, and you can use their inherent functions in a specified way. Plug-ins are programs developed by others according to the interfaces supported by this program, which are not available in the program. They are applied to this program to enhance its functions or simplify some functions that are difficult or impossible to realize with scripts.