Q: What is the Internet?
A: "The Internet" refers to the worldwide network of interconnected computers, all of which use a common protocol known as TCP /IP to communicate with each other. Every publicly accessible web site is hosted by a web server computer, which is a part of the Internet. Every personal computer, cell phone or other device that people use to look at web sites is also a part of the Internet. The Internet also makes possible email, games and other applications unrelated to the World Wide Web.
Q: What is an Intranet?
A: any network of interconnected computers belonging to one organization, similar to but separate from or insulated from the Internet. Intranets use the same protocols and software that are used on the Internet. For instance, many organizations have special intranet web sites that can only be viewed from a desktop in their offices, or when connected to their Virtual Private Network (VPN).
Q: What is a URL?
A: look up at the top of this web page. Above the page you will see the "location bar" of your web browser, which should contain something very like this:
This is the Uniform Resource Locator (URL) of the web page you are looking at right now. A URL can be thought of as the "address" of a web page.
A URL is made up of several parts. The first part is the protocol, which tells the web browser what sort of server it will be talking to in order to fetch the URL. In this example, the protocol is http.
The remaining parts vary depending on the protocol, but the vast majority of URLs you will encounter use the http protocol; exceptions include file URLs, which link to local files on your own hard drive, ftp URLs, which work just like http URLs but link to things on FTP servers rather than web servers, and mailto URLs, which can be used to invite a user to write an email message to a particular email address.
The second part of the example URL above is the fully qualified domain name of the web site to connect to. In this case, the fully qualified domain name is www.asystemsusa.com. This name identifies the web site containing the page. The term "fully qualified domain name" refers to a complete web site or other computer's name on the Internet. The term "domain name" usually refers only to the last part of the name, in this case asystemsusa.com, which has been registered for that particular company's exclusive use.
The third part of the example URL is the path at which this particular web page is located on the web server. In this case, the path is /faq/default.asp. Similar to a filename, a path usually indicates where the web page is located within the web space of the web site; in this case it is located in the basic sub-folder of the faq folder, which is located in the top-level web page directory of our web site.
Q: What is HTML?
A: HTML, or HyperText Markup Language, is a simple markup language used to make web pages. Although all modern word processors and many specialized tools can be used to make web pages without learning HTML at all, learning HTML itself is a useful way to learn more about the web and provides more control over the results. Luckily, HTML is very simple and quite easy to learn.
Q: How does the web work?
A: When you sit down and look at web pages, you are using a web browser. This is the piece of software that communicates with web servers for you via the HTTP protocol, translates HTML pages and image data into a nicely formatted on-screen display, and presents this information to your eyeballs -- or to your other senses, in the case of browsers for the vision-impaired and other alternative interface technologies. Web browsers also appear in simpler devices such as Internet-connected cell phones, like many Nokia models, and PDAs such as the Palm Pilot.
The most common web browser, by a large margin, is Microsoft Internet Explorer, followed by the open-source Mozilla browser and its derivatives, including Netscape 6.0 and later. Apple's new Safari browser is gaining popularity on Macintoshes running MacOS X, and the Opera shareware browser has a loyal following among those who are willing to pay for the fastest browser possible, especially on older computers. The Lynx browser is the most frequently used text-only browser and has been adapted to serve the needs of the vision-impaired.
Q: What mean by www?
A: WWW are initials that stand for World Wide Web. A 'web' is a network of fibres or cables connecting different points. (Spiders make webs to catch flies.) The Web is one of the services available on the Internet. It lets you access millions of pages through a system of hyperlinks. Because it is 'world-wide', it was originally called the World Wide Web or WWW .
Q: What is a home page?
A: "home page" of a web site is the page that is displayed if you simply type in the domain name of the site in the address bar of your browser and press enter. For instance, when you type in www.cnn.com and press enter in the address bar, you go to CNN's home page. "Home page" can also refer to a page that serves as the table of contents and logical starting point for any collection of web pages, such as the personal web pages of an individual, even if it is not actually the top-level home page for the domain name. Also sometimes referred to as a "homepage."
Q: What are web pages?
A: every web site is made up of one or more web pages -- like the one you are looking at right now! This text is part of a web page, and is written in the HyperText Markup Language (HTML). In addition to text with hyperlinks, tables, and other formatting, web pages can also contain images. Less commonly, web pages may contain Flash animations, Java applets, or MPEG video files.
Q: Who controls the World Wide Web?
A: The short answer: no one. The TCP /IP protocol on which all Internet protocols are based was designed for military use and can continue to operate even if many systems are destroyed.
The long answer: the whois database that ultimately determines who holds what domain name for the .com and .net domains is currently managed by Network Solutions, Inc., a division of Verisign, under contract with the umbrella organization to which the various domain name registrars belong. Although no single person or organization controls the Internet, NSI 's brief experiment with redirecting all mistyped domain names to their own ads demonstrated that they do hold a great deal of practical power. This does not mean that they can do whatever they like, of course; political pressure and the threat of lawsuits led them to stop their ad-redirection policy, at least for now.
Internationally speaking, there is truly no one entity in charge, as each national domain (.uk, .fr, etc.) has its own registrars. Certainly the global physical network itself does not belong to any one company.
Q: How big is the Internet?
A: No one knows the exact answer. There is no one entity in charge of the Internet as a whole; address space is registered by large ISPs which then disseminate it to smaller ISPs and other companies. However, the Google search engine, widely considered the most effective as of this writing, currently claims to index over three billion web pages. Assuming for a moment 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 .
Q: Why do some web sites have www. in the name?
A: A web site can have any valid domain name. Starting the name of your web site with www. is a common convention and nothing more. There is nothing in the HTTP specification that says a web site must start with www. or any other prefix. It is simply a convention that began in the early days of the web and was used to distinguish a company's web server from its FTP server, gopher server, mail server, et cetera. 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.