Definition
Application security, or AppSec, is the practice of protecting software applications from threats throughout their entire lifecycle. It involves designing, developing, testing, and deploying applications in a way that prevents vulnerabilities and mitigates risks. This is achieved through a combination of secure coding practices, security testing, and ongoing monitoring to identify and address potential weaknesses. Implementing robust application security measures is crucial for safeguarding sensitive data, maintaining user trust, and preventing costly breaches. For instance, a web application firewall (WAF) is a common tool used to protect against common web exploits like SQL injection. AppSec is distinct from network security, which focuses on protecting the network infrastructure itself. You will encounter application security concepts on exams like CompTIA Security+, CySA+, and CISSP.