Web based Content Development

1) What is meant by World Wide Web?
WWW is a standard designed for the access of multimedia information over Internet. WWW is a set of protocols which contains several protocols like File transfer protocol (FTP), Telnet (Remote access), Hypertext Transfer Protocol (HTTP) and so on. The Internet browsers support these protocols. WWW is used to view the web documents. The web documents are written in a particular
language supported by WWW that is, Hypertext MarkUp Language.

2) What is a Uniform Resource Locator (URL)?
Uniform Resource Locator (URL) is the address of page by which it is accessed. URL is consists of three things, Protocol, server name and file path, for example, http://www.isibang.ac.in/drtc/faculty.htm. Examining this URL we can see the first part, i.e., http:// is protocol. That means the page is http page. www.isibang.ac.in is the address of server. /drtc is the directory under the server’s root directory where one file called faculty.htm is present which is being displayed.

3) What is DHTML?
Dynamic HTML (DHTML) allows a web page to change after it is loaded into the browser - there does not have to be any communication with the web server for an update. DHTML is named so because even after it is loaded on the browser it can be changed, without having to send a request to the browser. The different technologies that make up DHTML are DOM (Document Object Model), Layers, CSS (Cascading Style Sheets), and HTML.

4) What are server pages? Name different server pages available.
Server pages act as database connectivity languages, which help in creating Web Interfaces to databases, which convert the user queries into the database query language and retrieve the results and display on the browser. Some of the available server pages, today, are ASP (Active Server Pages) from Microsoft, JSP (Java Server Pages) from Sun Microsystems Inc. and PHP (Hypertext Preprocessor).

5) What is DTD?
One can define his own structure of XML document and give others to write the XML document against his own schema to avoid the mistakes. A schema is nothing but the logical structure of document. This schema is called as DTD (Document Type Definition)

6) What do you mean by Multimedia resources? What are its components?
Multimedia resources are those that contain more than one medium of content. The components are text, audio, images, video, animation, etc.
7) What is a Web Server? A Web server is a program that, using the client/server model and the World
Wide Web’s Hypertext Transfer Protocol (HTTP), serves the files that form Web pages to Web users (whose computers contain HTTP clients that forward their requests).

KEYWORDS
Browser : User’s software program for viewing & browsing information on the Internet.
DTD : Document Type Definition-this is the formal specification of a markup language, written using SGML
Element : An element is a fundamental component of the structure of a text document. Some examples of elements are heads, tables, paragraphs, and lists. Elements can contain plain text, other elements, or both.
Home Page : Originally, the web page that a browser is set to use when it starts up. The more common meaning refers to the top level document of a set of web pages.
HTML : HyperText Markup Language-HTML is an SGML DTD. In practical terms, HTML is a collection of platform-independent styles (indicated by markup tags) that define the various components of a World Wide Web document.
Linux : A free Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. Developed under the GNU General Public License, the source code for Linux is freely available to everyone.
Plug-In : This is a program that the browser uses to manipulate a downloaded file. It differs from a Helper Application in that the plug-in works inside the browser window.
SGML : Standard Generalized Markup Language – a standard for describing markup languages. A mark-up language alters the presentation of the content of a document. A generalised mark-up language can deal with many different document types, and a standard generalized mark-up language deals with all these documents in a standardised way.
Server : A main computer that serves the other computers attached to it.

Source: IGNOU Study Material