The prime aim of this article is to know about web application penetration testing. Web applications penetration testing is a finest method to find out the loopholes in the sanctuary seals of web applications. This exercise is essential to remain the web files complimentary from any online susceptibility or hacker’s threat. Web applications are the finest resource to recognize about the coding of any online software. Typically, the user knows about the front end interfaces of software. But the actual programming can be found in the source code of software.