When we call the GetType() method of the Object class, what happens under the hood?

Question

C++ / C#

When we call the GetType() method of the Object class, what happens under the hood? What does this method refer to, the object itself on the heap, or the object-type of this object? And, probably, another stupid question, where exactly is it written that this object is of such and such a type? In the object itself in the form of service information? How is infa written that this object is of such and such a type?

Answer 1

In Richter, by the way, in my opinion, everything is described the same, at least further.
tooslowexception.com/how-does-gettype-work

Answer 2

Do not be stingy and buy a book by Sasha Goldstein (500 rubles a digital copy costs), look at Stanislav Sidristy's book, there is a github. Everything is well described there. And the internal structure of the class, and how function calls, including virtual ones, occur. Immediately a lot of questions will disappear.