Libraries such as OpenGL access the graphics card and can produce graphics programs, how does these libraries access the graphics card since they are implemented using C. According to what i've heard, C and C++ do not provide graphics features built in the language and producing graphics requires libraries. How then are these libraries written in C? The same question applies for sound also?

Are additional features to C/C++ languages such as graphics, sound, internet access written in lower level languages and then provided to the C/C++ using libraries?

I would be thankful for any summary which correct my concepts, or any suggested readings on the web or books.

opengl graphics
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