Operators are sets of symbols or special words that sit alongside the keywords in a query and tell the search engine how to process them. Operators let users specify whole phrases, words to exclude, words that should appear, and words that should appear close together. We can also mix includes and excludes with phrase searching. Of course, you will notice that this is not a perfect approach for this search. Search, AltaVista, Infoseek, and Excite.
Boolean operators can add even more specificity to a search.
By placing one of the Boolean operators between terms you can include and exclude terms, find cases where terms occur close together, and account for synonyms for words in a phrase. Several operators can be used at once with parentheses to create even more complex searches. More about search engines Here are four selected resources on search engines. The Spider's Apprentice Kansas City Library's review of the major search engines includes a chart that compares their features.