The Services menu (or simply Services) is a user interface element in macOS. The services are programs that accept input from the user selection, process it, and optionally put the result back in the clipboard. The concept originated in the NeXTSTEP operating system, from which it was carried over into macOS and GNUstep. Similar features can be emulated on other operating systems.
This is the discription of  Services menu, which category is it more suitable for Servieces menu, NeXT or MacOS user interface or GNUstep Your entire response should be in English, and in all capital letters.
user