CNET GLOSSARY: Terms for the techie
Boolean search techniques (named for English mathematician George Boole) use AND, OR, and NOT to refine Web searches or database queries. You use the AND Boolean operator when you're looking for all terms in your search string, OR when you're looking for at least one of the terms, and NOT when you want to exclude a term. The operators are usually referred to in uppercase letters, although they can be used in lowercase format as well.
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