After brainstorming keywords, it’s time to construct your search for use in library databases. The functionality for doing so is typically built into database search interfaces , usually through drop-down menus that default to AND.
These connecting words in the drop-down menus are called Boolean operators and they can help you better limit or expand your search for more relevant results. Let’s use a real life example to make sense of this: John and Jane are going out to dinner, but they cannot seem to agree on where to go. John was sushi, but Jane really wants Thai food.
Clearly, John and Jane should go with sushi AND Thai, so both of them can be happy. These operators in library databases work the same way!
It's also a good idea to consider where you are searching. This is especially important in databases that search the full-text of all documents, like JSTOR.