https://sites.google.com/view/howtouseaiinapplicationsd8e/ai-copilots-that-write-secure-code AppSec is a multifaceted, robust strategy that goes far beyond the simple vulnerability scan and remediation. The ever-evolving threat landscape, coupled with the rapid pace of technology advancements and the increasing complexity of software architectures requires a holistic and proactive approach that seamlessly incorporates security into all phases of the development process. This comprehensive guide outlines the essential components, best practices and cutting-edge technology used to build an extremely efficient AppSec program. It empowers companies to enhance their software assets, reduce the risk of attacks and create a security-first culture. The success of an AppSec program is based on a fundamental shift in the way people think. Security must be considered as an integral part of the development process and not an extra consideration. This paradigm shift necessitates close collaboration between security teams as well as developers and operations personnel, breaking down the silos and fostering a shared feeling of accountability for the security of the software they design, develop, and manage. DevSecOps lets companies integrate security into their process of development. This means that security is addressed throughout the process, from ideation, design, and deployment all the way to regular maintenance. This collaborative approach relies on the creation of security guidelines and standards, which offer a framework for secure programming, threat modeling and management of vulnerabilities. These guidelines should be based on the best practices of industry, including the OWASP top ten, NIST guidelines as well as the CWE. They should take into account the particular requirements and risk characteristics of the applications and the business context. By writing these policies down and making available to all interested parties, organizations are able to ensure a uniform,