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"In digital circuit theory, combinatorial logic (also called combinational logic) is a type
of logic circuit whose output is a function of only the present input. This is in contrast
to sequential logic, in which the output depends not only on the present input but also on
the history of the input.
In other words, sequential logic has memory while combinatorial logic does not.
Combinatorial logic is used in computer circuits to do boolean algebra on input signals and
on stored data. Practical computer circuits normally contain a mixture of combinatorial and
sequential logic. For example, the part of an arithmetic logic unit, or ALU, that does mathematical
calculations is made from combinatorial logic, although the ALU is controlled by a sequencer
that is made from sequential logic."  http://en.wikipedia.org/wiki/Combinational_logic
