The .ws top level domain (TLD) has numerous availability of quality, easy to remember .ws domain names. So if "site.com" is taken, "site.ws" can still be available—and ".ws" names work 100% globally, just as ".com" names do.
The .ws domain represents the country of Samoa, which was formerly referred to as Western Samoa. It's easy to think of .ws as WebSite. The .ws TLD is intended for use by the general public, companies, or other organizations—the same way a .com can be used. ".ws" is an officially sanctioned top level domain recognized by every country in the world that has Internet access, and needs no special software for its usage.