A website domain name can be trademarked if it acts a symbol to indicate the source of your goods or services. The mere registration of a domain name does constitute the use of the domain as a trademark. The mark must be used or displayed in the sale or advertising of services or products and the services are rendered in commerce. A domain name typically consists of a top level domain extension, such as .com, .org, or .net, and a second level domain name, such as pepsi in pepsi.com.  The second level domain name is eligible for trademark registration and protection if it meets the statutory requirements. The USPTO will not consider top level domain extensions in a trademark application.