A wildcard is a special character that can be added to a phrase while searching and the search engine/directory looks for all possible endings. The results will provide all possible documents in their database that have those letters.
"autom*"results: automatize, automobile, automatic or automotive
"educat*"results: educator, educators, education or educational
"profes*"results: profess, professor, profession, professional or professionalism
Technology AND Computers
Results: locate all documents in the databases that have both of these words
Technology NOT Computers
Results: will provide a list of links that has the word "technology" in the document but will not include any document that has the word "computers" in the document
Technology OR Computers
Results: will provide a list of links that has the phrase technology or computers in the document
Technology AND Computers NOT Internet
Results: the sites that have "technology" and "computers" but not "Internet"
Technology NEAR Computers
Results: one term must be located within a certain number of words
Nesting Allows the user to perform multiple tasks:
Technology AND (Internet OR World Wide Web)