Click Through- the process of clicking on a link in a search engine output page to visit an indexed site.

Direct Hit- A system which monitors the search engine users’ selections from search engine results, counting which results are clicked on most, and how long visitors spend at that site, so as to improve relevancy.

Dynamic Content- Information on web pages which changes or is changed automatically, e.g. based on database content or user information. Sometimes it’s possible to spot that this technique is being used, e.g. if the URL ends with .asp, .cfm, .cgi or .shtml.

Inbound Link- A hypertext link to a particular page from elsewhere, bringing traffics to that page.

Mirror Sites- multiple copies of web sites or web pages, often on different servers. The process of registering these multiple copies with search engines is often treated as spamdexing, because it artificially increases the relevancy of the pages.

Page Popularity- A measure of the number and quality links to a particular page (inbound links).

Siphoning- The use of various means to steal another site’s traffic. Techniques used include the wholesale copying of web pages (with the copied page altered slightly to direct visitors to a different site, and then registered with search engines) and the use of keywords or keywords or phrases “belonging” to other organizations, companies or web sites.

Spamdexing- The alteration or creation of a document with intent to deceive an electronic catalog or filing system. Any technique that increases the potential position of a site at the expense of the quality of the search engine’s database can also be regarded as spamdexing also known as spamming or spoofing.

Voila- A search engine from France Telecom with interfaces in at least different languages and a mission to become one of the leading international engines.