TLD
A Top Level Domain (TLD) is the uppermost in the hierarchy of domain names.
There are two types of TLDs. The most common type is the Generic or Global TLDs which include .COM, .NET, .ORG, .MIL, .INT and .EDU. There is a possibility that new gTLDs will be introduced in the near future. National or ccTLDs are two letter country code domains (i.e. .uk or .fr ) that are managed by a registry designated and controlled by each specific country.
Each registry might have differing prices, residency requirements and structure.