Over the years, we have been building software where different layers of the application were built together. Different teams work on different layers and build together a product that is very easy to develop, test and deploy. This practice can be represented as a monolithic architecture. The microservice architecture enables the rapid, frequent and reliable delivery of large, complex applications. It also enables an organization to evolve its technology stack. The drawback of this architecture is that as the application grows, the codebase starts intimidating developers and if new members join the team, it becomes difficult for them to understand the structure quickly.
Large applications that are tightly coupled are often very difficult to deploy and scale and switching the entire codebase to a new technology also becomes a big challenge. Microservices solve these challenges of monolithic systems by being as modular as possible. In the simplest form, they help build an application as a suite of small services, each running in its own process and are independently deployable.
