The side-bar of any webpage is a good place to put repeated content such as links to specific services, sub-sections of your website, adverts and call-outs.
About The Generic Web Company...
Some businesses or people may choose to explain a little more about the nature of their work or business, perhaps pointing out just what it is about them which makes them special, what they're proud of and so on...
An ideal location to display your 'mission statement', a defining affirmation of whatever it is that you do.
Many websites, especially those of businesses often go on to describe how they came to be, what part of the market they hold and other relevant business information. Some sites also go on to describe some of those within the company or group, club, circle, you name it.
As you will probably have noticed by now this is not the website of a real company but an example of a typical website to give you some idea of the possibilities. For more details please see the FAQ page which will explain just what can be done with these simple ideas.