I get that it’s open source provided you use codium not code but I still find that interesting
eli5, but isn’t visual studio code a part of visual studio? or why is it not? or is this like a java/javascript thing where they are named similar because of popularity but have no codebase in common?
Those two are completely different products.
Visual Studio is a full IDE which include full microsoft SDK (C++, .net, etc), while VSCode is a text editor forked from Github’s Atom text editor (which was the precursor of the Electron framework), with a javacript editor core called Monaco.