They are special keywords and signs that are utilized by users in order to get the most accurate search results. Although search engines usually provide the most accurate results, users may need to boost search engines in some specific queries. In such cases, users may utilize search operators in order to get and filter the most accurate results. For example, when the query "site:zeo.org seo” is carried out, pages containing the word "seo" are listed; when the query “site:zeo.org intitle:seo” is carried out, pages whose title contains the word "seo" are listed; and when the query "site:zeo.org inurl:seo” is carried out, pages which URL contains the word "seo" are listed.