Product of Sums form, or POS form, is a method of writing logical equations. In this form, the equation consists of multiple terms which are all AND'd together. In turn, each of these terms consists of one or more variables which are all OR'd together. Example:

     _   _   _     _                 _                 _
F = (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C) · (A + B + C)

Here each of the terms are within parenthesis, and consist of variables OR'd together. Each of the terms, then, is AND'd together.

See also sum of products.