.org .net .gov .com and .mil are examples of what
Generic top-level domain The initial set of generic top-level domains, defined by RFC 920 in October 1984, was a set of "general purpose domains": com, edu, gov, mil, org. The net domain was added with the first implementation of these domains. The com, net, and org TLDs, despite their originally-specific goals, are now open to use for any purpose.