This architecture principle was created by [1] Alistair Cockburn in 2005. This is one of the many forms of DDD(Domain Driven Design Architecture). The goal was

This architecture principle was created by [1] Alistair Cockburn in 2005. This is one of the many forms of DDD(Domain Driven Design Architecture). The goal was to find a way to solve or otherwise mitigate general caveats introduced by object oriented programming. This is also known as Ports and Adapters architecture. The hexagon concept isn’t related to a six side architecture nor does it have anything to do with the geometrical form. A hexagon has six sides indeed, but the idea is to illustrate concept of many ports. This shape is also easier to split into two and to be used as a representation of the business logic of the application. The idea is to separate the application we want to develop into essentially three separate parts. The left, the core and the right. Going into an even broader concept we want to differentiate the concepts of inside and outside. Inside is the business logic and the application itself and outside is whatever we are using to connect and interact with the application.