The differences between HTML and XHTML are small. As the rules of XHTML are based on those of XML, the same exceptionally strict rules apply as with XML. The major differences are outlined below.

The most important difference between the two markup languages is that HyperText Markup Language, or HTML, is an application of SGML (Standard Generalized Markup Language)1 and allows an author to omit certain tags and use attribute minimization. The Extensible HyperText Markup Language, or XHTML, is an application of XML (Extensible Markup Language). It doesn’t permit the omission of any tags or the use of attribute minimization. XHTML documents must start with an XHTML DocType declaration....

SSI stands for “server-side include,” a type of HTML instruction telling a computer that serves Web pages to dynamically generate data, usually by inserting certain variable contents into a fixed template or boilerplate Web page. Used especially in database searches. In order to use Server Side Includes, your server must be configured to support them.

SSI can help make your pages more responsive and can even help make maintaining your site an easier task. SSI is primarily used to “paste” the contents of one or more files into another. For example, a file (of any type, .html, .txt, etc.) containing a daily quote could be included into multiple SSI-enabled pages throughout a website by placing the following code into the desired pages:...

URL is an acronym for Uniform Resource Locator and is a reference (an address) to a resource on the Internet. The unique address of any Web document. The following is an example of a URL which addresses the Java Web site hosted by Sun Microsystems:

The Extensible Hypertext Markup Language, or XHTML, is a hybrid between HTML and XML that is more universally acceptable in Web pages and search engines than XML. Both standards are powerful, but XHTML is significantly better than HTML.

XHTML uses three XML namespaces (used to qualify element and attributes names by associating them with namespaces identified by URI references. Namespaces prevent identically custom-named tags that may be used in different XML documents from being read the same way), which correspond to three HTML 4.0 DTDs: Strict, Transitional, and Frameset. ...

Wiki is a piece of server software that allows users to freely create and edit Web page content using any Web browser. Wiki supports hyperlinks and has a simple text syntax for creating new pages and crosslinks between internal pages on the fly.

Wiki is a term meaning “quick” in Hawaiian, that is used for technology that gathers in one place a number of web pages focused on a theme, project, or collaboration. Wikis are generally used when users or group members are invited to develop, contribute, and update the content of the wiki....

RSS is the short for Really Simple Syndication, also known as Rich Site Summary). RSS refers to a group of XML based web-content distribution and republication (Web syndication) formats primarily used by news sites and weblogs (blogs). Any website can issue an RSS feed. By subscribing to an RSS feed, you are alerted to new additions to the feed since you last read it. In order to read RSS feeds, you must use a “feed reader,” which formats the XML code into an easily readable format (feed readers are to XML and RSS feeds as web browsers are to HTML and web pages.

An RSS document, which is called a “feed”, “web feed”, or “channel”, contains either a summary of content from an associated web site or the full text. RSS makes it possible for people to keep up with their favorite web sites in an automated manner that's easier than checking them manually....

A plugin (plug-in, addin, add-in, addon or add-on) sometimes also called extension, is a computer program that interacts with a host application (a web browser or an email client, for example) to provide a certain, usually very specific, function “on demand”. Applications support plugins for many reasons. Some of the main reasons include: enabling third-party developers to create capabilities to extend an application, to support features yet unforeseen, reducing the size of an application, and separating source code from an application because of incompatible software licenses.

In other words, A plug-in is an application built into a browser or added to a browser to enable it to interact with a special file type (such as a movie, sound file, Word document, etc.) ...

ISP is the short for Internet Service Provider, a company that provides access to the Internet. For a monthly fee, the service provider gives you a software package, username, password and access phone number. Equipped with a modem, you can then log on to the Internet and browse the World Wide Web and USENET, and send and receive e-mail.

An ISP has the equipment and the telecommunication line access required to have a point-of-presence on the Internet for the geographic area served. The larger ISPs have their own high-speed leased lines so that they are less dependent on the telecommunication providers and can provide better service to their customers. Among the largest national and regional ISPs are AT&T WorldNet, IBM Global Network, MCI, Netcom, UUNet, and PSINet....

DNS is the short for Domain Name System (or Service or Server), an Internet service that translates domain names into IP addresses. Because domain names are alphabetic, they’re easier to remember. The Internet however, is really based on IP addresses. Every time you use a domain name, therefore, a DNS service must translate the name into the corresponding IP address. For example, the domain name www.cavsi.com might translate to 198.105.232.4.

A domain name is translated in huge tables standardized across the Internet into a numeric IP address unique the host computer sought. These tables are maintained on computers called “Domain Name Servers.” Whenever you ask the browser to find a URL, the browser must consult the table on the domain name server that particular computer is networked to consult. ...

A blog (short for “web log”) is a type of web page that serves as a publicly accessible personal journal (or log) for an individual. Typically updated daily, blogs often reflect the personality of the author. Blog software usually has an archive of old blog postings. Many blogs can be searched for terms in the archive. Blogs have become a vibrant, fast-growing medium for communication in professional, poltical, news, trendy, and other specialized web communities.

A weblog often has the quality of being a kind of “log of our times” from a particular point-of-view. Generally, weblogs are devoted to one or several subjects or themes, usually of topical interest, and, in general, can be thought of as developing commentaries, individual or collective on their particular themes. A weblog may consist of the recorded ideas of an individual (a sort of diary) or be a complex collaboration open to anyone. Most of the latter are moderated discussions. ...