Sum of Products form, or SOP form, is a way of writing logic equations. In this form, the equation consists of multiple terms, each of which are OR'd together. Each term, then, only consists of a number of variables which are all AND'd together. This is called "sum of products", because traditionally, OR is represented by the "+" sign, and AND is represented by "·". Here is an example:
     _   _         _       _         _   _     
F = (A · B · C) + (A · B · C) + (A · B · C)
Each term is within parenthesis here, and has all of it's variables AND'd together, and each of the terms are then OR'd. This particular equation also happens to be in canonical form.

See also Product of Sums.

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