Monolithic architecture

Monolithic architecture-based systems existed before the SOA or Microservices movement. These types of systems are exactly the opposite of what SOA tries to achieve.

A typical Monolithic system is an enterprise-based application, and this application might be in the form of a large website with all the working modules packaged in together into one single package, or it might be in the form of a service which talks to a website. It might be packaged as a large executable that is deployed on a machine.

In these systems, we added different components to an application to keep growing; there's no restriction in size, and there's no division. There's always one package which contains everything, and therefore, we end up with a large code base.

The high-level architecture diagram of a Monolithic system would look as follows: