What is a sub domain? A sub domain or sub domains are part of a hierarchy if larger or parent domain. It is sometimes called the vanity domain.

The configuration of subdomains is very much likely to be a domain name lookup. Once a request is made for a sub domain, the request will be transmitted to a web server that contains the web information for the parent or larger domain. Various combinations of sub domain configurations are possible by using web server entries and web server application setup for load distribution, application isolation or security purposes. Sub domains that are configured in web servers are called web sub domains. However, creating sub domain web folders is different from configuring a sub domain, since sub domain folders are considered to be third level domains for its unique feature of organizing your website content. They are simply folders under your root directory, but to access them, a special URL is used.

Sub domain names are integrated with DNS (Domain Name System), which basically stores and organize various types of information, labeling them with domain names. These domain names are converted into an IP address or host name. A domain name usually consists of two or more parts and separated by dots. The right most parts of the domain name are called top sub domains. Good sub domains are better alternative for webmasters whose site is hosted by a free hosting service, since by using these domains, users will not need to remember the bulky web addresses associated with free hosting accounts.

Focusing on keywords density and value of sub domain ranking is important on SEO ranking, since it gives possibility for search optimization of the web surfers.

Various websites host free sub domain or free sub domains services as well as providing free web hosting sub domain. Among these websites include Bravenet Hosting, 1Freehost.net, Web1000, 3000mb Free Subdomain Hosting, NetFreeHost, and Tripod. These free sub domain websites have shorter addresses than any other free host sites. Free sub domain hosting is indeed very useful and helpful for online business people. There are also available web site hosting sub domains that need not be registered. And since you don't have to register your sub domain, you can immediately use your sub domain name even without the confirmation on the domain registration transfer from your domain host.

Sub domains are often a very good choice for your new home since the URL is short and easy to remember. Some search engines also give sub domains a slight boost over conventional free hosting addresses.