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IM
IM (instant messaging) provides an instant response manner of communication over the Internet, similar in many ways to a private chatroom.
The main IM software packages are all free - Yahoo Messenger, Live Messenger (neé MSN Messenger), AIM, ICQ and Skype.
Impression
One display of an image or advertisement. Or A single view of a web page, document or some other item to be measured by views.
Inbound link
When site A links to site B, site A has an outbound link and site B has an inbound link. Inbound links are counted to determine link popularity, an important factor in SEO.
Index file
A file created by a search indexer program, designed to store information in a format that makes fast retrieval possible.
Information retrieval
A field of study related to information extraction. Information retrieval is about developing systems to effectively index and search vast amounts of data.
Inverse document frequency (IDF)
A measure of how rare a term is in a collection, calculated by total collection size divided by the number of documents containing the term.
Very common terms ("the", "and" etc.) will have a very low IDF and are therefore often excluded from search results.
Invisible text
Text on a web page that is exactly or almost the same color as the background. The use of invisible text to load a page with keywords was
once a popular SEO technique, but search engines can now detect invisible text and penalize sites that use it. Although there are examples
of sites that use invisible text and "get away with it" on Google, the general consensus is that it is not worth the risk.
IP spoofing
A controversial technique for reporting a false IP address. In the context of search engines, IP spoofing is sometimes used to refer to the practice of cloaking.
IPTV - Internet Protocol Television
IPTV is the term used to describe the provision of television services over the Internet.
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