Purpose of stdafx.h [duplicate]

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stdafx.h is a file, generated by
Microsoft Visual Studio IDE wizards,
that describes both standard system
and project specific include files
that are used frequently but hardly
ever change.
Compatible compilers (for example,
Visual C++ 6.0 and newer) will
pre-compile this file to reduce
overall compile times.

Visual C++ will
not compile anything before the
#include "stdafx.h" in the source file, unless the compile option
/Yu'stdafx.h' is unchecked (by
default); it assumes all code in the
source up to and including that line
is already compiled.

http://en.wikipedia.org/wiki/Precompiled_header

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