Here is a code snippet of a DNS prefetch that is placed in the
<link rel="dns-prefetch" href="http://www.paperjetwednesday.com/">
DNS prefetching attempts to resolve the domain names before the user follows a link to that domain. If the domain has been resolved, the advantage of this will be that there is effectively no delay due to DNS name resolution.
An excellent example of using DNS prefetching would be for results in a search that link to various other domains. Here are a few types of prefetching: