Despite its intimidating name, Boolean search techniques are really quite simple to learn and can add tremendous effectiveness to your searching. While working through this part, most of you will recognize constructs that were taught to you in high school math. He developed Boolean algebra, which is the basis for this form of structured search technique.
Boolean algebra is also of prime importance to the design of modern computers.
Most information on the Web is highly unstructured. Boolean search techniques were first applied by information professionals to traditional search services like Dialog or Lexis-Nexis. Boolean techniques, while not supported by all Internet search services, provide a way for you to bring structure to this unstructured environment. Without Boolean techniques, you are stuck with doing a lot of free-text searching, meaning, looking for documents that contain words you think will be in the document you are seeking. Sheer document volume makes free-text searching difficult and prone to failure.