Lisp stands for list processing and is the second oldest computer language in the world. Being developed in 1959, it lost the title to FORTRAN by only a few months. It is typically interpreted, but compilers are available for some platforms. Attempts were made to standardize the language, and the standard version is called "Common Lisp". There have also been efforts to simplify the language, and the results of these efforts is another language called Scheme. Lisp is a fairly portable language, but is not particularly fast. Today, Lisp is most widely used with AI software.