A domain that serves no cookies. The idea here is that you use a cookie-free domain to serve images, CSS files, scripts and whatnot, so that your users don't waste time and bandwidth transmitting cookies for them. SO uses sstatic.net for the purpose, for example.
The main reason the concept is of any note is that most people can't use a subdomain of their main domain to do this (like SO couldn't use static.stackoverflow.com) because they serve cookies that are valid across the entire second-level domain.
Source: http://serverfault.com/questions/78227/what-is-a-cookie-free-domain
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