Domain Name System (DNS) is organized hierarchically based on labels. DNS names are composed of character strings separated by periods. Each of these character strings is called a label. Labels form a hierarchy, in which higher levels are at the right. So, for example, in the name server1.mysite.info, .info is the top-level domain (TLD). mysite is an intermediate level label. server1 is the label for a specific object in mysite.info. Note that server1 is specifically in mysite.info (not just mysite), because there can be other domains including mysite. For example, there could also be mysite.org, mysite.com, or mysite.biz. These are all different domain names, and someone wishing to register the domain name mysite in general would need to register that phrase with every TLD. This may not even be feasible, given the recent expansion of TLDs by ICANN.