Software Architecture refers to the high-level structure of a software system, defining its components and their interactions. It serves as a blueprint for both the system and the project developing it, ensuring that the software meets both technical and business requirements. A well-defined software architecture helps in managing complexity, facilitating communication among stakeholders, and guiding the development process. It encompasses various architectural styles, such as Microservices and Monolithic, which influence how the software is built and maintained over time.