A domain name is the name you type to get to a site. If you're planning a business site, a domain name is a must. After all, if you won't spend the few dollars or pounds for a domain name, how reliable is your product or service likely to be, and how seriously are you taking your business? When you choose a domain name, think about your keywords, and try to include them if possible. Registration of a domain name generally lasts for one or two years. Prices vary depending on which company you register the domain name with and the type of domain name you choose. A .com domain name, for example, is usually more expensive than a .co.us address because of its worldwide status.