In the realm of cybersecurity, web application security is a critical concern for organizations worldwide. The WEB-200: Offensive Security Web Application Exploitation and Countermeasures guide is a comprehensive resource designed to equip security professionals with the knowledge and skills necessary to identify, exploit, and mitigate vulnerabilities in web applications. This write-up provides an overview of the WEB-200 guide, highlighting its key components, and the importance of offensive security in the context of web application security.