Are you familiar with any Defect Tracking Tool?

In past I have used Quality Center which is a very popular tool from HP. I have used it to plan my testing, to write test cases and loading it to test lab based on testing scenarios. I have experienced using MS Product Studio and MS Team Foundation and One open source tool call Bug Tracker

Why testing?

Testing helps to, quality of software can be measured. Testing helps to find defects in software product from different point of views. Testing gives confidence about software's quality.

What is functional specification?

It is a document describing how your end product, your program look and work. It defines what is the application supposed to be, What it supposed to do and who will be using it in general.