Traditionally, monolithic architecture has been used to develop large-scale apps. However, people have realized its drawbacks and limitations over time. Without adapting to modern agile practices and limited flexibility does not allow for a productive development process. Therefore, organizations have been searching for better, more reliable architecture to facilitate the development of large-scale, complex apps with a more productive workflow.

In most modern programming, there are objects that get involved with every aspect of an application. They are on a very high level in the hierarchy and need to interact with almost all other objects directly to ensure the proper functioning of the app. More often than not, these are objects involved in the overlaps of business logic: a User, Booking, or Account.