The Secure Software Development Framework (SSDF) by NIST is a comprehensive guide aimed at embedding security into the Software Development Lifecycle (SDLC) to preemptively address vulnerabilities. The framework emphasizes four main components: preparing the organization by clearly defining roles, responsibilities, and security requirements; protecting software by securing codebases and verifying software integrity; producing well-secured software through secure design and coding practices; and responding to vulnerabilities by continuously identifying, prioritizing, and remediating them. The latest revision, published in February 2022, introduces new practices such as securing the development environment and documenting security requirements, along with practical examples to help organizations implement these practices effectively. The SSDF underscores the importance of creating applications that are secure by design and maintaining vigilance in addressing potential security threats post-launch.