Impression

Impression is the number of times an ad banner is seen by visitors on the web.

Inbound links

links that point to your site from other are called inbound links which will improve your site's PageRank.

Indexed Pages

The pages on a site which have been indexed.

Information Retrieval

The field of science based on sorting or searching through large data sets to find relevant information.

Index

Index is the search engine's database in which it stores textual content from every web page visited by spiders.

Internal Link

Link from one page on a site to another page on the same site.

It is preferential to use descriptive internal linking to make it easy for search engines to understand what your website is about. Use consistent navigational anchor text for each section of your site, emphasizing other pages within that section. Place links to relevant related pages within the content area of your site to help further show the relationship between pages and improve the usability of your website.

Invisible Web

Vast amount of information on the web that is not indexed by the search engines is called as invisible web.

IP Address

Internet Protocol Address. Every computer connected to the internet has an IP address. Some websites and servers have unique IP addresses, but most web hosts host multiple websites on a single host.

IFRAME

"IFrame (from inline frame) is an HTML element which makes it possible to embed another HTML document inside the main document. The size of the IFrame is specified in the surrounding HTML page, so that the surrounding page can already be presented in the browser while the IFrame is still being loaded. The IFrame behaves much like an inline image, and the user can scroll it out of view. On the other hand, the IFrame can contain its own scroll bar, independent of the surrounding page's scroll bar.

IDF

Inverse Document Frequency is a term used to help determine the position of a term in a vector space model. IDF = log (total documents in database / documents containing the term)

Information Architecture

Designing, categorizing, organizing, and structuring content in a useful and meaningful way. Good information architecture considers both how humans and search spiders access a website.

Indexability

Also known as crawlability and spiderability. Indexability refers to the potential of a web site or its contents to be crawled or "indexed" by a search engine. If a site is not "indexable," or if a site has reduced indexability, it has difficulties getting its URLs included.

Inktomi

Search engine which pioneered the paid inclusion business model. Inktomi was bought by Yahoo! at the end of 2002.