Microservices are an architectural and organizational approach to software development where software is composed of small independent services that communicate over well-defined APIs. 

These services are owned by small, self-contained teams. 

https://microservices.io/

Microservices - also known as the microservice architecture - is an architectural style that structures an application as a collection of services that are

Independently deployable

Loosely coupled

Organized around business capabilities

Owned by a small team

Highly maintainable and testable

The microservice architecture enables the rapid, frequent and reliable delivery of large, complex applications. It also enables an organization to evolve its technology stack.

https://microservices.io/