Serving as a window to your online world, the web browser has become one of -- if not -- the most important pieces of computer software used on a daily basis. Not only are browsers used to access websites for information and e-commerce, but for many, it's a conduit to entertainment (such as streaming videos or online games), communication (including web mail sites) and social networking with friends (be it Facebook, MySpace and Twitter). At this point in time, there are five major browsers to choose from: Microsoft's Internet Explorer, Mozilla's Firefox, Apple's Safari, Google's Chrome and the self-titled browser from Opera. All of them are free to use, they work with most operating systems and enjoy frequent updates to fix problems or add new features. Deciding which one to go with, however, boils down to personal preference -- or in some cases, laziness, if the web browser was already installed on your PC and you don't care to change it.