[Solved] What is the underlying mechanism behind va_list and where is it defined?

aste123 Asks: What is the underlying mechanism behind va_list and where is it defined?
va_list – C++ Reference According to the above link, va_list is an argument or parameter used in some macros – va_start, va_arg, va_end. These macros are present in the stdarg.h file.

I know that va_list can hold multiple values but what kind of an entity is va_list? My question is what is the underlying mechanism behind va_list? How is it able to hold multiple values? (For example, an array can hold multiple values and the mechanism behind it is multiple memory locations referenced by subscript values. Array is a predefined data structure present in C.)

My second question is where is va_list defined?

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