(1) For software applications, front end is the same as user interface.
(2) In client/server applications, the client part of the program is often called the front end and the server part is called the back end.
(3) Compilers, the programs that translate source code into object code, are often composed of two parts: a front end and a back end. The front end is responsible for checking syntaxand detecting errors, whereas the back end performs the actual translation into object code.
