A software framework is a pre-built collection of code and tools that provides a foundation for developing applications. It offers a structured way to build software by defining best practices, reusable components, and a set of guidelines. This helps developers save time and maintain consistency across projects. Frameworks can be specific to certain programming languages, such as Django for Python or React for JavaScript. They simplify complex tasks, allowing developers to focus on the unique features of their applications rather than starting from scratch. By using a framework, developers can enhance productivity and improve code quality.