The AOP module is one of the key components of Spring MVC. It provides a powerful framework for Aspect-Oriented Programming, which can be used to solve many common software development problems. For example, AOP can be used to modularize cross-cutting concerns such as logging, data validation, and security. This makes it possible to cleanly separate these concerns from the application's business logic, making the code more maintainable and easier to understand. In addition, AOP can also be used to improve performance by reducing the amount of duplicate code that needs to be executed. Overall, the AOP module is a valuable tool that can help make Spring MVC applications more robust and efficient.