Linguistics and computer science intertwined in the mid-20th century. Computers help linguists better understand and analyze languages and computer scientists use linguistics to advance programming.
When you're writing code, you're laying out instructions on what you'd like to see on the app you're building or the website you're designing. But there are a number of coding languages to choose from ...
(Also it's not really a pyramid, it's a graph; programming languages et al. obviously rely on theoretical computer science, and theoretical CS is a branch of mathematics and as such not limited by the ...