What is the difference between software architecture and software design?

Software architecture is concerned with the high-level structure and organization of software systems, while software design deals with the lower-level details of how software components are implemented to meet the requirements specified in the software architecture.

In other words, software architecture defines the overall structure, components, and relationships of a software system, while software design focuses on the implementation details of individual components, including algorithms, data structures, and interfaces. Software architecture provides a conceptual blueprint for the software system, while software design deals with the implementation details to realize that blueprint.