System design is the process of defining the architecture, components, modules, interfaces, and data for a system to satisfy specified requirements. It involves creating a blueprint that outlines how different parts of a system will work together to achieve desired outcomes. This can apply to software, hardware, or a combination of both. In software engineering, system design focuses on structuring software applications to ensure they are scalable, maintainable, and efficient. It often includes considerations for user experience, data flow, and integration with other systems, ensuring that all elements function cohesively to meet user needs and business goals.