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Penetration testing (pen testing) includes evaluating an application or infrastructure for vulnerabilities. Pen testing identifies numerous vulnerabilities inside the system. In addition to this, it also determines what causes these vulnerabilities. Hackers carry out attacks to uncover security vulnerabilities and assess their strengths. In this article, you’ll learn what penetration testing is and why it is used. It also highlights the different types and approaches to penetration testing. The article also lists some of the most popular tools used by pen testers.