Psychology

Using AND, OR, and NOT to combine your search terms.

In a Boolean search, keywords are combined by the operators AND, OR and NOT.

AND (means only)
AND narrows your search by showing only those records that contain both keywords.

Example: peanut butter AND jelly only finds records that have both peanut butter with jam
OR (means  either)
OR expands the search to include records containing either keyword, or both.

Example: peanut butter OR jelly finds records that are about peanut butter, about jam, or both.

NOT (means exclude)
NOT narrows the search by excluding unwanted terms.

Example: peanut butter NOT jelly finds records that only focus on peanut butter, but excludes jam.