Security Testing is a process that checks systems for vulnerabilities, threats, and risks which could compromise system security. Coursera's Security Testing catalogue teaches you to identify, evaluate, and mitigate potential risks in software systems. You'll learn about the various types of security testing such as penetration testing, vulnerability scanning, security auditing, and risk assessments. Additionally, you'll gain insights into best practices for protecting systems and data from unauthorized access, use, disclosure, disruption, modification, or destruction. By mastering these skills, you can enhance system resilience and work towards maintaining a safe digital environment.