In a monolithic architecture, processes are tightly coupled and run as a single deployable artifact. While this is relatively simple to begin with, scaling up or modifying one part of your microservice application requires updating the entire service, resulting in inefficient scalability and increased complexity as your codebase grows in size.
Microservices architecture involves a collection of loosely coupled services that can be independently updated and scaled by smaller teams. Because individual services are easier to build, deploy, and manage than a single monolithic application, microservices enable more frequent deployments, data store autonomy, and increased flexibility.
Organizations are transitioning their entire applications to microservices architecture in order to drastically decrease time to market, more easily adopt new technologies, and respond faster to customer needs.