A search using the AND operator will return hits that contain both words linked with an AND operator. You will almost always use at least one AND operator. Bibliography is the description of publication data of a source. Boolean operators the words AND , OR , and NOT can be used with most search engines and databases to customize a query. These terms are used in conjunction with search terms or keywords .
Databases frequently use controlled vocabularies.
Library catalogs use controlled vocabularies for subject headings. Searches using controlled vocabularies differ from keyword-based searches. Full text records are useful as they allow the researcher the ability to immediately access information without having to locate the hard copy cited by the database hit a hit is a item returned as a result of a search conducted on a search engine keywords keywords that describe the topic or subject of your search that are entered into a search engine keyword search search engines frequently conduct searches in a keyword mode by searching all text contained in the database for the desired terms. Keyword searches are generally less reliable than subject searches . Effective keyword searches usually require Boolean operators .