Server architecture refers to the design and structure of a server system, which includes the hardware and software components that work together to provide services to users. It typically involves a combination of physical servers, virtual machines, and cloud services, all configured to handle requests and manage data efficiently. Different types of server architectures exist, such as client-server, microservices, and monolithic architectures. Each type has its own advantages and is chosen based on the specific needs of an organization, such as scalability, performance, and ease of maintenance.