Aspect-oriented software development is a new technology for separation
of concerns (SOC) in software development. The techniques of AOSD make
it possible to *modularize lightweight crosscutting* aspects of a system. And reinformce seperation of concerns.

For example like Logging at a method level, it is difficult and cumbersome to inherit a base class for logging. it is hard to understand and difficult to maintain.

Security and error handling, those are infrastructual coding related not business functionalities.

Aspect Oriented Programming - AOP