AutoLISP is based on the LISP programming language, which is simple to learn and very powerful. Because AutoCAD has a built-in LISP interpreter, you can enter AutoLISP code at the command prompt or load AutoLISP code from external files. Visual LISP (VLISP) is a software tool designed to expedite AutoLISP program development.
AutoLISP applications are stored in ASCII text files that you can edit. Before you can use an AutoLISP application, it must first be loaded.
You can load AutoLISP routines each time you run AutoCAD. You can also execute certain commands or functions at specific times during a drawing session.
