Inbound Marketing Glossary: I

the ultimate inbound marketing glossary

Inverse Document Frequency (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 )

Inbound Link

Link pointing to one website from another website. Most search engines allow you to see a sample of links pointing to a document by searching using the link: function. For example, using link:www.seobook.com would show pages linking to the homepage of this site (both…

Index

Collection of data used as bank to search through to find a match to a user fed query. The larger search engines have billions of documents in their catalogs. When search engines search they search via reverse indexes by words and return results based on matching…

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,…

Inktomi

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

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. Information architecture suggestions: focus each page on a specific topic use…

Internet

Vast worldwide network of computers connected via TCP/IP.

Internet Explorer

Microsoft’s web browser. After they beat out Netscape’s browser on the marketshare front they failed to innovate on any level for about 5 years, until Firefox forced them to. See also: Download IE Inverted File (see Reverse…

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. Many SEOs refer to unique C class IP addresses. Every site is hosted…

ISP

Internet Service Providers sell end users access to the web. Some of these companies also sell usage data to web analytics companies. Italics (see emphasis)