The structural purpose of a software framework is to provide a standardized foundation for software development, offering pre-defined structures and common functionalities that facilitate the coding process. Frameworks typically include libraries, tools, and best practices, streamlining the development of applications by reducing redundancy and promoting consistency. By following a framework, developers can focus on building specific features rather than starting from scratch, leading to improved efficiency and higher quality code. Examples include Django for web applications and TensorFlow for machine learning.