What exactly are you looking for web hosting ? You can just google it, my friend, instead of asking here, so you might get what you are searching for By the way, if you are looking for any cheaper web hosting plans, dont go for it, you might have some issues later!!!
To establish your online presence in the business worldwide, web hosting is a major factor as it reflects more number of visitors to experience your site. The facts that your have to be known on hosting is that domain name, band width and disk space available for your web site. Depending on your websites purpose, hosting plan varies.
Security and backups are two very important aspects that you need to consider. You should always choose a web hosting service with reliable telephone support. Some also offer 24/7 support through local or toll-free numbers. In case you are running an ecommerce website then security is one aspect that you just cannot discard. Your web hosting service provider should be such that they can monitor things round the clock and ensure no unwanted intruder can hack your site.
Online support is very common today. Every hosting service provide, I think, is providing online support. The thing you should take care of is the space and bandwidth required and available and the security and control.
I suppose that Wikipedia will give your all the answers in nitty-gritty details about hosting itself.