Penetration testing refers to a set of services used to 
detect various security issues with web applications.

A penetration test is a method of evaluating the security 
of a computer system or network by simulating an attack by 
a malicious user, known as a cracker (though often 
incorrectly referred to as a hacker). The process involves 
an active analysis of the system for any potential 
vulnerabilities that may result from poor or improper 
system configuration, known and/or unknown hardware or 
software flaws, or operational weaknesses in process or 
technical countermeasures. This analysis is carried out 
from the position of a potential attacker, and can involve 
active exploitation of security vulnerabilities. Any 
security issues that are found will be presented to the 
system owner together with an assessment of their impact 
and often with a proposal for mitigation or a technical 
solution. The intent of a penetration test is to determine 
feasibility of an attack and the amount of business impact 
of a successful exploit, if discovered.

Penetration testing is nothing but Security testing . How 
well our app. build is protected against un authorized 
users.