APL is a programming language created by Kenneth E. Iverson in the 1960s. It is a concise, powerful, and often unconventional language that is particularly well suited for working with arrays and matrices.
APL has a small but dedicated following of programmers who swear by its efficiency and expressiveness. While it is not nearly as popular as languages like Java or Python, it has been used in a number of notable projects, including the development of the original Apple Macintosh computer.
If you're looking for a language that will make you think about programming in new and different ways, APL is definitely worth checking out.