Rockwell Schrock's Boolean Machine, embedded below, is a simple way of demonstrating how operator words (and, or, not) function in a search engine.

Schrock's boolean machine is a simple way to show learners how the terms "and", "or", "not" affect the outcome of a search. It is a simple program to use. To use the boolean machine simply hold your mouse pointer over each word and you will see an explanation of how each operator word affects the search outcome.

Use the embedded version below or go to http://kathyschrock.net/rbs3k/boolean/#.