What are new gTLDs?
There are two main categories of Top Level Domains: country code top level domains (e.g. .be, .fr, .es) and generic top level domains (e.g. .com, .info, .net).
In order to improve competition and consumer choice, ICANN has decided in 2011 to open up the gTLD space. The additional top level domains are called "new gTLDs".
Small scale additions to the namespace have been made since 2000. In contrast, ICANN now decided to authorise any new gTLD which meets the published criteria. The window for applications closed at the end of April 2012.
The complete list of TLDs available in the root zone database is available on the IANA website.