On TeX and LaTeX relations

Question

Could you help me with the following questions?

I have downloaded the source files of MiKTeX of the last version and I want to see the source code of latex.exe but cannot find it. Where is it located?
When I process my .tex file into a .dvi file via latex.exe then what exactly this program does? Does it use "virgin" TeX? It is said that LaTeX is a set of macros based on TeX. For example, pure TeX does not know environments. When I compile my LaTeX file containing environments then are they translated into pure TeX (maybe taken from format files?) and then processed by tex.exe (or by something like a TeX core)? [If TeX has tex.exe and LaTeX has latex.exe, then what is the dependence of LaTeX on TeX?]
Am I right that the relations between TeX and LaTeX are somewhat like pure C and a library in C language so you can just use already defined functions and not to touch the low-level stuff?

https://tex.stackexchange.com/questions/49/what-is-the-difference-between-tex-and-latex/85#85 Perhaps? — Joseph Wright, Aug 16 '20 at 19:39
Why do you contemplate compiling your .tex file to a .dvi file? Compiling straight to .pdf is the default nowadays the default with all major TeX engines (though not with "Knuth TeX"). — Mico, Aug 16 '20 at 20:16
@Mico: It’s easy for beginners to end up using dvi — many older introductions/tutorials prescribing dvi still get recommended to newcomers either just from inertia or because they’re good tutorials in other ways. — Peter LeFanu Lumsdaine, Aug 17 '20 at 08:10
Does this answer your question? What is the difference between TeX and LaTeX? — Martin Schröder, Aug 18 '20 at 07:35

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