Software design is the process of defining the architecture, components, interfaces, and other characteristics of a software system. It involves creating a blueprint that guides developers in building the software, ensuring it meets user needs and functions effectively. Good software design emphasizes usability, maintainability, and scalability. It often includes various methodologies, such as Agile or Waterfall, to structure the development process. By focusing on these principles, software design helps create reliable and efficient applications that can adapt to changing requirements over time.