How are keywords described in programming languages?

Question

Programming

Here, for example, for C Sharp.
In Visual Studio, we can easily move on to defining one or another standard namespace or class (and if not in Visual, then it’s stupid to find it in .Net folders). But how are the keywords for, if, etc. described. After all, VS does not allow you to see the source code. Where can they be found in .Net? Explain for the time being to the lamer :-)

Answer 1

in the source code of a specific compiler :) keywords are "directly" converted to "binary" code.
in the source text parsing system into the work/algorithm tree of the compiled function.
Wikipedia, for example
, is an analogue of a bolt and a nut, their structure is not described in the drawing, considering them to be fundamental objects.