You can also use OR to combine keywords in a search. Using OR means that an article will be retrieved if it contains either keyword. OR is best used to search for synonyms of a concept. Because any one of these words could show up in your articles, OR broadens your search.

Internet OR Web
Using this search in a periodical index would find all of the citations that mention either Internet or Web.

Internet OR Web OR online OR digital OR wired
You can use OR many times in a single search.

You can make very complex searches by combining the use of AND and OR in a technique called nesting. Did you know that the terms AND and OR are called Boolean operators?