Boolean is a form of logic used in computer searching.
"Boolean operators are a fundamental component of a kind of algebra called Boolean Logic. Named after 19th century English mathematician George Boole, Boolean Logic boils down all values to one of two states: true or false."
"Boolean Operator." Gale Encyclopedia of E-Commerce. Ed. Jane A. Malonis. Vol. 1. Detroit: Gale, 2002. 75. Gale Virtual Reference Library. Web. 17 June 2013.
Common Boolean operator's are "and", "or", and "not". Theses are frequently used when searching databases with keywords.
Examples: Boolean Operators