
Many of the web addresses are quite long and complicated. It is difficult to remember or comprehend them sometimes. Moreover, if you want to pass on a long and complicated web address in some SMS message or in a web service that has character size limit (such as Twitter), it is not possible to do so. Many a time, the size of the long web address itself may be more than the size limit permitted by the web service, even if you forget including some other helpful text with the web address. The answer to this problem is URL shortening services that are available online for free.
Just to illustrate, consider the following URL which has 108 characters:
http://www.microsoft.com/downloads/details.aspx?FamilyId=941B3470-3AE9-4AEE-8F43-C6BB74CD1466&displaylang=en
Now consider the following URL which has just 25 characters and points to the same web address as above after shortening the above URL:
http://tinyurl.com/y5a879
Or even better, you can just use the following URL which has only 18 characters and it also points to the same web page (this is after removing the “http://” expression):
tinyurl.com/y5a879
You can immediately notice the difference that a shortened URL makes! It is easy to remember and easy to input in an SMS message, etc. Moreover, you won’t have a size limit problem with such shortened URL when using it on a site such as Twitter.
There are several free web services available today which can shorten the web address into a small URL. You then have to just use that small URL to visit that web page and need not type the full web address. TinyURL is one of the most popular URL shortening service. At the last count, there are more than 300 million web pages having shortened URLs from TinyURL. [If you want to learn about bit.ly, another popular URL shortening service, then please visit Shorten your URLs with bit.ly and get also many other features].
To shorten a long web address using TinyURL, you can use any of the following four methods:
http://tinyurl.com/api-create.php?url=http://www.techsuperb.com/

TinyURL also offers a preview feature for viewing the details of the shortened URL before actually going to the web address. This may be useful if someone has apprehensions about the shortened URL pointing to some harmful web address. If you want to enable preview of the shortened URL, you simply add “preview.” in the URL. For example, the shortened URL for this Tech Superb site http://tinyurl.com/nyb543 will become http://preview.tinyurl.com/nyb543. If you visit this shortened URL with preview feature, you’ll first get details of the full web address to which it points and only on your confirmation you’ll be taken to that web address. See the following image for this preview:

Some other popular URL shortening services are Bit.ly, urlTea.com, Shorl.com and SnipURL.com.
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http://ziprl.com is also another excellent url shortening service.
TinyURL is too old to mention these days. My personal recommendation is bit.ly which has a real-time statistics tracking feature.
http://www.aisajib.com/2009/09/01/use-bit-ly-url-shorteners-firefox-plugin-to-shorten-and-preview-links/
Aminul, I agree that bit.ly has become more popular nowadays. I had mentioned it towards the end of the article and intended to do a regular article on it including the features that it offers.