A microservice is a software development technique where an application is structured as a collection of small, loosely coupled services. Each service is designed to perform a specific function or task within the application and can be developed, deployed, and scaled independently. Microservices communicate with each other through well-defined APIs, allowing for flexibility, scalability, and resilience in the overall system. This approach enables teams to work on different services simultaneously, promotes faster development cycles, and makes it easier to update or replace individual services without affecting the entire application. Overall, microservices architecture is known for its agility, maintainability, and ability to adapt to changing business requirements.