- An API is an agreement that outlines how a user should utilize the underlying service.
- A microservice is a type of architectural architecture that divides an application—typically a monolithic one—into smaller, independent services.
This implies that an API, which enables interaction with the microservice itself, is typically a component of a microservice. The way to look at it is that the microservice’s API acts as a contract for interactions within it by outlining the various ways users can communicate with it.
Moreover, as we can see from the microservices above, each microservice is constructed slightly differently depending on its requirements. Below are some examples of the various tasks a microservice might perform:
- Performing CRUD operations for a specific element, like a customer, event, etc., Data persistence in a database would be possible thanks to this service.
- Supplying a way to take inputs and compute (perhaps intensive) computations to produce results. Without the need to retain data, the aforementioned billing microservice can receive information about an event or a client and return the necessary billing information.
You can undoubtedly see from the above that a microservice is capable of becoming more than just a system’s API. Microservices that use their APIs to communicate with one another can make up a whole application.
Additionally, each of these microservices has the ability to abstract its functionality, delineating logical responsibilities within the application and dividing concerns to create a codebase that is easier to maintain.
It will be easier for you to understand the difference between API and microservice with a tabular format.