Damn Small Vulnerable Web (DSVW) is a deliberately vulnerable web application designed for educational purposes and security testing. Written in under 100 lines of Python code, it provides a lightweight platform for learning about web application vulnerabilities and practicing security testing techniques. The application includes implementations of common web vulnerabilities such as XML External Entity (XXE) attacks, XPath injection, and other popular web application security flaws. It serves as a controlled environment where security professionals, students, and researchers can safely explore and understand various attack vectors without risking production systems. DSVW runs as a local HTTP server and can be accessed through a web browser for hands-on vulnerability testing and exploitation practice. The application requires Python 3.x and optionally python-lxml for certain vulnerability types like XML External Entity attacks. Its minimal codebase makes it easy to understand, modify, and deploy for training scenarios.