Web hosting involves an understanding of the following concepts.
To get to a Web site, you have to click on, or type in, its name in a Web browser. The name of the Web site is technically referred to as a URL (Uniform Resource Locator) and looks something as:
http://mysite.com.
A URL consists of two parts, the http:// which tells the browser to use the HTTP protocol to get to your site, and your site's name, mysite.com which is technically called the site's site name. A site name is a human-understandable and unique name for your site.
Notice that a site name consists of a series of strings separated by dots. Each string within a site serves to make the overall site name unique. For instance, suppose there are two companies both called Mycompany Corporation in, say, the US and India. Then, they could be assigned the site names myco.us and myco.in. Thus, both of them have the string myco in the site name, but the suffix us or in makes them unique.
To keep things manageable, the Internet authorities have created a set of top level sites as com, net, org, edu and so on. A Domain Name Registrar is given control over one or more of these top-level sites.
Anyone who wants a site within a top level site (that is, a site name ending in the top-level site's name) contacts a Domain Name Registrar and asks the registrar to register their name. The registrar ensures that the name is unique, and, for a small fee, registers the name. For instance, if MyCo Corporation would want to own the site name myco.com, it can contact the Domain Name Registrar for the .com site and ask the registrar to register the site name myco.com. Once this is done, anyone can type myco.com and get to the myco.com site. There are many Domain Name Registrars, and some of them, for example, register.com are very popular.
When you type in a URL into a browser, your computer has to contact the computer on the Internet (also called a host) that contains the Web site with that name. For example, if you type http://myco.com in your browser, your computer has to contact the computer that hosts the myco.com Web site. It does so by sending a packet (a small amount of data) to the myco.com computer saying show me the main page of the myco.com Web site. The myco.com Web site replies with the main page. To make this work, the Internet has to somehow transmit packets from your computer to the computer that hosts the myco.com Web site. While the myco.com computer is easily identified by its unique site name, it is really much easier to transmit the packet if the destination is identified by a number rather than a name. The number that corresponds to a site name is called a computer's IP address, for example 129.31.212.144.
Every computer on the Internet and every Web site must correspond to an IP address. Your Web site hosting company will provide you with a set of IP addresses that you can allocate to the Web sites that you create.
There are two ways to host sites. The first is to create the site with its own IP address. This is called IP-based hosting. You must create IP-based sites if the site needs anonymous FTP and its own secure-site (SSL) support.
The second way to host sites is to create a site that shares the primary IP address of the server. This is called name-based hosting. Name-based sites receive most of the benefits of an IP-based site without occupying an IP address.
All the standard sets of services are available to IP-based and name-based sites, except SSL encryption. SSL is not supported for name-based sites.
IP addresses are scarce resources. To conserve IP addresses, you can arrange to have many sites share the same IP address.
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