[rohitarondekar]

I think everyone of us should try and specialize in at least one thing. That does not imply that you do your best to know nothing about relevant fields. For example if you are a web developer who works on Ruby on Rails and makes awesome web apps but don't like working on the front‒end, i.e HTML/CSS/JS then that is OK as long as you have some basic knowledge about those technologies and respect those who do work in that area.

Back to the specialization, I really think you should have at least one area in your chosen field where you have deep knowledge. How deep? On the above example - maybe you know internals of Rails + Rack very well. If you are on the front‒end may be you should have a thorough understanding of how browsers work, how HTML/CSS is parsed and rendered etc. I don't really have a good explanation as to why this is important but I've noticed that the really good web developers or designers tend to have at least one specialization or deep interest within their fields.