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网络营销/电子商务词典：搜索引擎/互联网基础应用相关词汇（I）
【说明】：下列词汇为网上营销新观察通过多个网站的相关资源整理汇总，并未一一核对词汇内容的准确性，对词汇的解释不代表本站的观点，仅供初步参考，如需要严格考证词汇的意义，请参考互联网相关的专业词典。
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.
【说明】：上述词汇为网上营销新观察通过多个网站的相关资源整理汇总，并未一一核对词汇内容的准确性，对词汇的解释不代表本站的观点，仅供初步参考，如需要严格考证词汇的意义，请参考互联网相关的专业词典。
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