AppSec, short for Application Security, refers to the processes, tools, and practices designed to protect software applications from threats and vulnerabilities throughout their lifecycle. This includes identifying, fixing, and preventing security flaws in applications, whether they are web, mobile, or desktop-based. AppSec involves activities such as secure coding, code reviews, vulnerability scanning, penetration testing, and implementing security controls within the development pipeline. The goal is to ensure that applications are resilient against attacks like SQL injection, cross-site scripting (XSS), and unauthorized access. As cyber threats evolve, AppSec has become a crucial aspect of modern software development and deployment.