Copyright, year, the name of your business. All other use is expressly prohibited. Obviously, when you have a business, it must be possible to find you, in other words that you are intelligently located. All addresses have three parts. The center section indentifies you in a unique manner, and with the last part, forms the domain name.
All large businesses have one.
Trademarks identify a product or service and allow for an association to be made between the trademark and a business. They are often registered with the Trademark office of the various countries. If I were to say to you CocaCola, you would know right away what it means and who sells it. Thus you see that there is a link between domain names and trademarks because both allow you to identify yourself, both allow you to distinguish yourself from others. Up until very recently, these organizations, which are not governmental organizations, granted domain names without regard to other laws to which they could run into conflict with.