Microservices is an architectural style that structures an application as a collection of small, independent services that communicate with each other. The document discusses the benefits of microservices such as simplicity, partial development, availability, consistency, and modularity. It also notes potential disadvantages like additional complexity from cross-origin resource sharing and adopting a new architectural pattern. Examples of microservices architectures using technologies like AngularJS, Nginx, MongoDB, and Azure are provided.