This is a URL suppressor. I mean if you have a URL to some article in some newspaper or in some blog and it has more than 30 or more characters, then you can just use this site www.tinyurl.com to suppress it and make it tiny. Go to the website. Paste the long link that has to be suppressed. And click submit. The site returns you with a link that in this format www.tiny.com/<some code>
where <some code> is a string of random characters and numbers.
With this feature, posting URL in twitter or sending SMS is easy and helps save time. :)
TinyURL needs no registration and its simple and cool. Try out!