Why was the World Wide Web invented?  

The idea behind the invention of World Wide Web or WWW was to create a common information space in which we communicate by sharing information Tim Berners-Lee is the founder of WWW.

Why do some web sites have www. in the name?

Starting the domain name of your web site with www is a common convention and nothing more. It began in the early days; the purpose was to distinguish a company's web server from its FTP server, gopher server, mail server, etc. But no such distinction is necessary, because web servers respond on TCP port 80, which is distinct from port 25 (outgoing mail), port 110 (POP mail), port 21 (FTP control), et cetera. A single domain name can host all of these services, and a single physical computer may actually respond to many different domain names.

As a matter of common practice, most webmasters make sure their sites respond to both www.mycompanyname.com and mycompanyname.com, because the former is the first guess many people will make, and the latter is both more convenient to type and easier to fit into an advertising logo. It is rare for a well-run web site to reject either name.

What is World Wide Web Accessibility?

 An accessible site can be easily used by individuals with disabilities, especially blindness and vision impairment. There are at least three good reasons to design your pages to accommodate such users:

• First of all it’s the right practice.
• It will definitely help reach more customers.
• Most importantly because search engines experience the web much as blind users do: through text. If it's not there in easily accessible text, it's not helping anyone search for your site.
• Because users of new web browsing devices, such as wireless handhelds and cell phones, experience the web the way blind users do. (They may be able to see some images, but only with difficulty and frustration.)

How is WWW Driving Internet?

Even before the launch of World Wide Web Gopher servers were already providing a user-friendly means of sharing information. The introduction of web browsers and HTML made Internet publishing accessible to a mass audience and greatly increased demand for Internet access.

The open and free concept on which the Web is based made it possible for content providers to publish without paying license fees to any one central organization such as America online, Compuserve or Microsoft. The nonproprietary nature of the Web drove its acceptance by those on the supply side of the equation, in turn generating new demand as new groups of users discovered web sites of interest to them.

How big is the Internet?

This can’t be answered because it keeps on growing. There is no one entity in charge of the Internet as a whole. Google claims to index over three billion web pages, if for a moment we assume that the average web site has 50 indexable web pages and that Google indexes two-thirds of the web sites that exist, there are roughly 40 million web sites in the world. Most estimates put the number of individual users with Internet access at around 300 million, with the largest concentrations in the United States, Europe, and parts of Asia.

How many web sites exist?

There is no exact answer to this question. We can only make crude estimate. The web is growing all the time, no one is in charge, and by the time you've counted a tiny fraction of it, many sites have come and gone. For one thing, a good definition of a web site is hard to pin down; a reasonable definition might be "a fully qualified domain name, such as www.example.com, which delivers unique or mostly unique content." This rule out, for instance, alternate names for the same site that always fetch exactly the same pages.

As of this writing, Google states that they are indexing 4,285,199,774 distinct web pages. But not every page is indexed by the Google search engine, and web sites are made up of multiple pages.