When you search a database or library catalog the system will not understand what you are looking for if you just type in your research question.
Narrow or expand your search by using specific connectors: AND, OR, or NOT
AND Connects two or more words (or phrases) • Narrows the search • Will produce information on water and pollution

OR Allows either word (or phrase) to be included somewhere in the search results • Broadens the search • Will produce information on either water or on pollution or maybe water pollution

NOT Excludes select terms (or phrases) from a search Warning! Use Cautiously Will produce information on everything to do with water except water pollution