C language is a very powerful programming language. It has a broad range of features like support for many data types, operators, keywords, etc., allows structuring of code using functions, loops, decision-making statements, then there are complex data-structures like structures, arrays, etc., and pointers, which makes C quite resourceful and powerful, etc.
Using the C language you can easily read, write and create files. This may sound like a basic feature today, but in the early 1990s, this was a game-changer.