For the longest time, the structure of a typical business application remained the same. Implementation details could vary, but the solution invariably consisted of the front end, the business logic, and the data management layer.
We started with monolithic applications running on mainframes. From there, we progressed to the client/server architecture with the business logic distributed across desktop applications and database procedures. This approach was later replaced with thin apps running in the browser and the business logic residing in the middle tier. Eventually, the middle tier was broken down into functions and microservices.
