>>40
Scheme is a minimalist Lisp, mostly used for teaching and good for embedding in other applications, but many people use it for real work too.
Common Lisp is an industrial-strength Lisp, multi-paradigm programming language with a rich library, and many features.
However, some Scheme implementations do have enough extensions to reach and maybe exceed the size of Common Lisp, at the same time, there's many portable(and less portable) libraries for Common Lisp.
The technical differences are too many too list, so I'll link you this instead
http://c2.com/cgi/wiki$?LispSchemeDifferences