URL Redirection

URL redirection, also called URL forwarding and the very similar technique domain redirection also called domain forwarding, are techniques on the World Wide Web for making a web page available under many URLs.

At least that is what Wikipedia says.

URL Shorteners

• http://goo.gl
• http://bit.ly

URL Enlargers

• http://hugeurl.com
• http://www.reallyhugeurl.com