Basic graphics question

[Jackle]

   I just started to explore the C language, and there is one question I can't
find an answer to.  I would like to create some graphics on IBM PC in either
VGA or MCGA modes, but unfortunately I'm missing *.BGI drivers.  Can someone,
please, tell me what they are, what they do, and how do I use them?  Also,
are they included in graphics.lib, or should I look for them some place else?
Thanx in advance, J.