Processing architecture refers to the design and organization of a computer's processing units, which are responsible for executing instructions and managing data. It encompasses the arrangement of hardware components, such as the central processing unit (CPU), memory, and input/output devices, to optimize performance and efficiency. Different types of processing architectures exist, including Von Neumann and Harvard architectures, each with unique characteristics. The choice of architecture affects how data is processed and stored, influencing the overall speed and capability of computing systems, from personal computers to large-scale servers.