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I
iBL / ibl
Short for inbound link.
image map
An image that has different clickable areas linked
to different pages. Image maps can either be imbedded in the HTML
code or called as an external file. Search
engines usually have difficulty spidering
image maps when they are included from external files.
impression
One display of an image or advertisement.
Also see CPM
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.
For more on link popularity, link building and the importance of inbound
links in SEO, please refer to the Search Engine
Yearbook.
Also see reciprocal link
index
Plural: indices / indexes.
Referring to the searchable database
of documents stored by a search engine
- often simply referred to as a search engine's database. When used
as a verb, it describes the process of converting a collection into
a searchable database. The term is sometimes also used to refer to directories
like ODP.
index file
A file created by a search indexer program, designed
to store information in a format that makes fast retrieval possible.
information
extraction / information filtering
A field of study related to information
retrieval that attempts to identify semantic structures in order
to extract relevant data.
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.
Infoseek
 Infoseek
is the old name for the Go.com search
engine. Go.com was acquired by Disney and started displaying results
from Overture, a PPC
search engine. At the moment it displays results from Google.
Inktomi
 A
large database of web sites, started
in 1996, that feeds results to somesearch
engines. Inktomi also provides a range of other services, including
content networking solutions, search solutions and wireless solutions.
For a more detailed look at Inktomi and it's importance in SEO,
please refer to the Search Engine Yearbook.
intranet
Essentially a web site or group of (usually interlinked)
web sites that is only accessible to people within a specific group
or organization. Most large companies have intranets. Intranets offer
a safe place for employees to publish information that improves workflow.
Intranets typically house shared applications, internal telephone and
e-mail directories, rules and regulations, help files etc. Many large
intranets have a search facility that allows users to find specific
information more easily.
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 therefor often excluded from
search results. These low IDF words are commonly referred to as "stop
words".
Also see term frequency.
inverted file
A file that represents a collection
of documents or database. The inverted
file lists all words that appear in all documents in the database, as
well as a reference to the document where the word appears.
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. The same results can usually be achieved
by working the keywords into the visible body text.
invisible web
A popular collective name for documents of types
that search engines do not typically
index. Because they are not in any search engine
database, they can be very difficult
to find and are in a sense invisible. Recently a couple of specialized
search engines have begun an attempt to make the invisible web more
accessible.
IP
Internet Protocol. Essentially a set of standards
that are necessary to ensure that data sent between networks are readable
on both sides. IP provides the standard for the way data is scrambled
and sent over the Internet, while TCP (transmission control protocol)
provides a standard for the way data is unscrambled. These two standards
are essential to the working of the Internet.
IP address
Every Internet user and every server has a numeric
address. Something like 123.45.67.890. IP addresses provide essential
identification online. Domain names can
be set up to have a unique IP address, something that is useful in SEO.
For more on the role of IP addresses in SEO, please refer to the Search
Engine Yearbook.
IP delivery
Similar to cloaking.
A technique for automatically delivering different pages to different
users based on the user's IP address. Although
IP delivery has legitimate uses (like delivering different content to
people from different geographical areas), it has been applied extensively
in cloaking, causing IP based delivery to be banned by most search
engines. For more on IP delivery and the potential dangers, please
refer to the Search Engine Yearbook.
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.
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