Ethical Hacking is also called Penetration Testing. It is the best practice to penetrate the system or network to discover threats and vulnerabilities that a hacker may find and exploit leading to loss of data, money etc. The activity of an Ethical Hacker is the same as that of criminal hackers but with the authorities' permission. In simple language, "Ethical hacking involves an authorized attempt to gain unauthorized access to a computer system, application, or data."