We can define microservices architecture as a way to develop an application using a set of small, low-coupling, independent, and deployable services. Each microservice is very well-defined, meaning that each microservice is responsible for a single task that is well-defined. 

So, microservices are small components that perform a specific job and may be used to benefit a business. Therefore, when developing an application under the architecture of microservices, we must break this same application into small components that are the microservices. As well as the other characteristics that we will see later, microservices can be changed and deployed without degrading the application itself.