Free Domain name vs Free DNS service

wxdqz

New Member
[To mod, it seems it is better to set a new thread for this question]

I have found the following 2 websites:
<!-- m --><a class="postlink" href="https://www.xname.org/index.php">https://www.xname.org/index.php</a><!-- m -->
<!-- m --><a class="postlink" href="http://freedns.afraid.org/">http://freedns.afraid.org/</a><!-- m -->

It seems I can set any domain name I like for these kinds of services.
What're the difference between:
- websites which offer a free domain name (eg <!-- w --><a class="postlink" href="http://www.dot.tk">www.dot.tk</a><!-- w -->); and
- websites like the above (which offer any kinds of domian names)

What're the pros and cons?
Any idea?
Thanks.
 
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