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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（D）
【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。
Dance
Short for Google Dance.
data traffic
Refers to the number of packets traversing a network.
database
An electronic filing system containing information that
is usually highly organized and categorized. The benefit
of electronic filing by means of a database is that specific
information can easily be extracted according to given parameters.
Search engines are essentially very large, searchable databases.
Dynamic web pages typically rely on databases.
dataset
See index.
date range / date limit
Most of the major search engines allow users to limit search
results to documents created / modified on / before / after
a specified date.
dead link
A link to a page that no longer exists or has been moved
to a different URL. Search engine spiders regularly respider
pages in its index and removes dead links. Most search engines
also offer ways for users to report dead links.
deep linking
The practice of linking to the inner pages of another web
site - as opposed to linking to the homepage. Although the
vast majority of site owners don't mind deep links to their
sites, it should be noted that deep linking has potential
legal ramifications.
de-listing
Referring to the removal of pages from a search engine index.
De-listing can occur at the request of the site owner or
a variety of other reasons. Most often, de-listing occurs
when a page breaks one of a search engine's submission rules,
making itself guilty of some sort of spamdexing. The Search
Engine Yearbook contains comprehensive guidelines to help
you avoid spamdexing and de-listing.
description
In the context of the search engines, the description refers
to the descriptive text accompanied by a title and URL in
the search results page. Some search engines take this description
from the meta description while most generate their own
from the page content. Directories often ask for a description
when you submit your page.
description tag
An HTML tag that gives a general description of the contents
of the page. This description is not displayed on the page
itself, but is largely intended to help the search engines
index the page correctly. Some search engines use the description
found in the description tag on their SERPs. A growing number
of search engines are completely ignoring the description
tag. For a more detailed look at the description tag and
other types of meta tags, please refer to the Search Engine
Yearbook.
DHTML
Dynamic HTML. DHTML is sometimes referred to as the next
generation HTML. It gives site designers increased control
over the appearance of a site.
Direct Hit
Discontinued search engine. It was acquired by Ask Jeeves,
who many feel failed to capitalize on its tremendous promise.
What made it special was that it tracked user behavior and
"learned" from it, constantly improving the relevance
of search results. Direct Hit has been assimilated into
Teoma, Ask Jeeves' other acquisition.
directory
A categorized collection of links to the web, usually compiled
manually. Directories can either be general (to the entire
web) like ODP or Topical like the Dotcom Directory. Although
they cannot rival search engines for index size, the generally
do offer higher quality search results, arrived at through
some editorial selection process.
DMOZ
See ODP.
DNS
Domain Name Service / Domain Name System / Domain Name Server.
Every computer on the Internet has a unique number called
the IP address. The IP address is almost like a telephone
number, but it's hard to remember everyone's IP address.
This is where DNS comes into play. The DNS is a static,
hierarchical name service that makes it easier to remember
web site addresses by allowing letters (the domain name)
to be used instead of numbers. Translating the name back
to the IP address is called "resolving" the domain.
DNS parking
A domain is set to be "parked" when it has been
registered but not developed into a web site. The registrant
pays the annual renewal fees to prevent the domain from
falling into someone else's hands. DNS parking is typically
done to protect trademarks. Domains registered for resale
are usually also parked.
document streams
One of the problems that search engines have to deal with
is that the web changes continuously. Their databases have
to reflect new trends, news stories etc. They have to index
document streams (e.g. news stories) that appear, tend to
grow in intensity for a while (burst) and then gradually
fade away.
Dogpile
www.dogpile.com
A popular meta search engine.
domain / domain name
A sub-set of internet addresses. Top-level domains are divided
into .com, .net, .org, .biz, .info, .gov and .edu. Apart
from these there are also country-specific domain extensions
like .ca, .com.au, .co.za, .fr etc. In SEO it is generally
accepted that having a keyword-rich domain is beneficial.
The Search Engine Yearbook contains a more detailed discussion
of the importance of domain name selection in SEO, as well
as what to look for when choosing a domain.
doorway domain
A keyword-rich domain name used to achieve high search engine
ranking for a particular keyword / key phrase. Similar to
a doorway page, the doorway domain serves only as a point
of entry that leads search engine traffic through to the
"real" content of the page. This technique is
not advisable. Domains containing only a page or two don't
normally rank well on the search engines and spiders typically
ignore pages that automatically redirect to other pages.
For a detailed discussion on multiple domains and automatic
redirection, please refer to the Search Engine Yearbook.
doorway page
Also known as bridge pages, bridging pages, entry pages
and landing pages. Referring to a page designed to rank
well for a selected keyword and redirect visitors to another,
"real" page. Important here is that there are
two kinds of doorway pages: those generated automatically
based on a template and manually created keyword focused
content pages (KFCPs). The first kind is considered spam
and penalized by most search engines. The second is an important
and usually very effective SEO technique. For a detailed
discussion of doorway pages and all the do's and don'ts,
please refer to the Search Engine Yearbook.
drill down
The action of clicking on links within a web site or directory,
working through categories and sub-categories, in order
to find specific information.
dynamic content
Web site content generated automatically, usually from a
database and based on user actions / selections. Dynamic
content typically changes at regular intervals, for example
daily or each time the users reloads the page. SERPs are
dynamically generated pages, changing depending on user
input.
dynamic optimization
The practice of adding fields to a database and page templates,
like for an ecommerce website, where just as each page has
a different product, the optimization elements are also
different. Usually limited to the page title, meta description
and meta keywords.
【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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