How to create a short URL

URL shortening is a technique on the World Wide Web in which a uniform resource locator (URL) may be made substantially shorter in length and still direct to the required page. This is achieved by using an redirect on a domain name that is short, which links to the web page that has a long URL. For example, the URL "http://en.wikipedia.org/wiki/URL_shortening" can be shortened to "http://tinyurl.com/urlwiki". This is especially convenient for messaging technologies that limit the number of characters that may be used in a message, such as Twitter and Identi.ca. In November 2009, the shortened links of the URL shortening service Bitly were accessed 2.1 billion times
                                                                                                        : WIKI