WHAT ARE BOOLEAN OPERATORS AND WHAT DO THEY DO?
Boolean operators are AND, OR, and NOT.
Boolean operators connect your search terms together in order to NARROW or BROADEN your search results.
If your topic contains several search terms, BOOLEAN OPERATORS help refine your search.
SEARCH ORDER
Databases commonly recognize AND as the PRIMARY BOOLEAN OPERATOR, and will search for the two terms connected by AND first.
If you use more than one Boolean operator in a search, be sure to enclose the terms connected by OR or NOT together in parentheses.
For example:
democracy AND (united states OR france)