How do I create a new file format? Is there a programming language for it or something else?

Question

I'm curious about file formats like how it's created and if I wanted to create one myself, what should I learn to achieve it?

Answer 1

1. Why on earth would you want to create a new file format?
2. From your question I get the impression that you don't really understand what a file format is.

Answer 2

Hi! Maybe you can start your journey here:

https://www.loc.gov/preservation/digital/formats/index.shtml