SEO Glossary: D

Data Center

The competence to use the home computer and the related elements as the storage system and telecommunications is simply known as Data Center. It mainly includes un-necessary power supplies, other old data, communication related to the data connections and other controls related to the environment.

Data Definition Language (DLL)

Data Definition Language explains the part of SQL which allows creating, changing or altering and demolishing the database. The database includes different tables, sequences, catalogs, indexes etc. The commands are implemented by the supervisor of the system. The implementation takes place at the time of setup of the database and at the time of removal of the databases.

There are four basic DDL commands namely, Create, Use, Alter and Drop. Four of these are explained in detail as under:

Create

Data Manipulation Language

DML is a computer language used for the retrieval, insertion, deletion and modification of the information. The regular users use number of commands DML commands as they use the system regularly. The details of the commands are as follows:

Insert

Digital Millennium Copyright Act

President Clinton passed the DMCA on October 28, 1998. This act implements two WIPO (World Intellectual Property Organization) treaties: the WIPO Copyright Treaty and the Phonograms treaty. The DMCA also caters other copyright issues. It is divided into five different titles:

Title I: WIPO Copyright and Performances and Phonograms Treaties Implementation Act

Digital Versatile Disk (DVD)

DVD is the media used for the storage of the data. Mainly the DVD is used to store any kind of video or data. The DVDs are similar as of the CDs or Compact Disks but the most important and distant thing is that the storage capacity of the DVDs is nearly six times larger that that of a CD.

There are different types of DVDs available. One of them is DVD ROM data can only read and saving any new data again is not possible. In the DVD R the data can be written once and then it is same as the DVD ROM. In the DVD RW or DVD Re-writable the data can be re-written many times.

Direct Hit (DH)

It is popular search engines that give results based upon what information other searchers have chosen during their previous search for the same terms. It measures what people are clicking at major search services across the globe in the internet. Multiple search terms are matched against previous searches. It also measures the length of time, people spend on these sites.

Direct Traffic Center (DTC)

DTC is a paid search engine facility. By using keywords, a person can get the list of sites where he can get the required information he is searching for. This is a paid search facility. The minimum cost per click per keyword is US$.10. People who want to advertise with overture will be aware of DTC. By logging in into DTC a person can manage every aspect of overture campaign like payment method, keyword sponsorships, advertising options and reporting. New ads can be easily created and launched with the section of this site.

Directory Mozilla

DMOZ or Directory Mozilla is also known as The Open Directory Project or ODP. It is a multi-linguistic site linked with many other sites and is maintained by the community of different volunteers who take care of the content part of the site. It was founded by the then engineers from Sun Microsystems. Its original name was Gnuhoo which was finally named as Open Directory Project after many changes and was owned by Netscape. Later on, AOL acquired Netscape and ODP became one of its assets.

Directory Results Pages

DRP is a program that shows an index of websites that contain relevant information a person is searching for. This is done by entering a key word or phrase into a text field and initiating the process. Search results are ranked according to the proprietary Page Rank relevance system. It is an affordable search engine optimization (SEO) for many businesses that operate mainly though the internet. The search engine has its own method of determining the relevancy of the sites. It is generally based on the following:

# Meta title
# Meta data
# Incoming hyperlinks

DMCA (Digital Millennium Copyright Act )

It is Copyright act of United States of America under criminal production and dissemination of technology that commences on 1996. WIPO treaty leads digital Millennium copyright act. It is commonly known as DRM that work is to criminalize the act of circumventing or any discrepancy or illegal trade of information technology.

It also charges penalties for any infringement of copyright act on net. It was passed on October 8, 1998 in the senate of US and in the reign of president bill Clinton. Online providers form copyright infringement by users and limit their liability of online providers.

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