Object oriented programming Why use, [Sanjay] Code is easy to manage, scalable, understandable. Why NOT to use, [Sanjay] Can't find any reason for not using. When to use, [Sanjay] Always When NOT to use, [Sanjay] Never what is the security and performance with useing and not useing [Sanjay] The OOP is more secure and provides better performance than non OOP (POP)