The document discusses the evolution of the software development life cycle (SDLC) and infrastructure as code (IaC). Historically, deploying code required manually configuring physical servers, which was time-consuming and error-prone. While waterfall and agile approaches improved collaboration, cloud computing and infrastructure as code further accelerated development. DevOps emerged to integrate development and operations teams, promoting security throughout the process. Static code analysis now automatically checks IaC templates for security issues early in development.