Explain the concept of aspect-oriented design (AOD) and how it differs from traditional Object-Oriented Programming.

Aspect-Oriented Design (AOD) extends the principles of aspect-oriented programming (AOP) to the design phase of software development. AOD focuses on identifying and modularizing cross-cutting concerns at the design level, such as logging, security, and transaction management, and integrating them into the overall system architecture. Unlike traditional Object-Oriented Programming, which focuses on encapsulating related data and behavior into classes, AOD emphasizes the separation and composition of concerns across different layers or components of the system architecture.