You can think of URL redirection like DNS. The story behind DNS all of the .com, .org, etc. names was that humans could never remember all of those IP's that were needed in order to access the servers. So since humans were good at remembering names, they associated names with the IP's. URL redirection is another similar concept. When you use a keyword for a URL it makes it easier to remember. The best thing is that you can call it what you like! The only thing you have to do is create it before someone else does. So start creating those keywords, before they are all gone!!!
URL redirection, also called URL forwarding, is a World Wide Web technique for making a web page available under a different URL address. When a web browser attempts to open a URL that has been redirected, a page with a different URL is opened. Creating kewords for URLs allows us humans to remember URL's more easily. We can remember a keyword very easily, we can't remember a long URL with many slashes charachters, or UID's etc. Keywords allow you to be more efficient while you are on the web, allowing you to do more with less time.
Similarly, domain redirection or domain forwarding is when all pages in a URL domain are redirected to a different domain, as when keyfind.us and keyfind.net are automatically redirected to keyfind.org. URL redirection can be used for URL shortening, to prevent broken links when web pages are moved, to allow multiple domain names belonging to the same owner to refer to a single web site, to guide navigation into and out of a website, and for privacy protection.