Google's search engine normally accepts queries as a simple text, and breaks up the user's text into a sequence of search terms, which will usually be words that are to occur in the results, but one can also use Boolean operators, such as: quotations marks (") for a phrase, a prefix such as "+", "-" for qualified terms, or one of several advanced operators, such as "site:". The webpages of "Google Search Basics" describe each of these additional queries and options ("see below:" Search options).