There are several reasons for creating a new language: ... The domain you're working in could benefit from having it's own language (domain specific languages) You want to challenge yourself or test a theory in language design. You want to extend/create vendor lock-in to a platform.

Why do people create new programming languages?

dissatisfaction with the hundreds of existing languages. untreated insanity. desire to implement language that facilitates new design concepts (like languages that make design patterns more straightforward to incorporate) other reasons, perhaps.

Why is programming language necessary?

Programming languages use classes and functions that control commands. The reason that programming is so important is that it directs a computer to complete these commands over and over again, so people do not have to do the task repeatedly. Instead, the software can do it automatically and accurately.