Web hosting is known as a hobby by most of the software people. People use to exchange their views of various things that they see around the world. This might be technical details, something related to their interests like movies, art, books, recipes and many more. Such web sites mostly with personal web sites usually need very less space since the data content posted is also very less.
A complex web site catering to the needs of many people might require a separate server and data base support and even for application development. Such advancements in the technology allow pople to install their own programs in the net and manage the contents. The web hosting may provide a separate connectivity for managing the control panel especially for maintaining the web server. Some best web hosting might specialize in few softwares and services, and these web sites might be handled and required by the large software companies.
Other web hosting companies offer a chance to make some money with hosting affiliate programs.
Very few critical elements that a client requires from a web hosting company would be maximum uptime and the site should be accessible via internet. Most of the web hosting services promise more than 99% but there might be chances of planned maintenance and down time of the servers which might lead to unreachable of your web site for a specified amount of time.