Microservices architecture (MSA) is being proclaimed as the most powerful architectural pattern for designing, developing, deploying, and delivering next-generation software applications. Microservices are clearly emerging as the prime building block for constructing enterprise-grade and mission-critical applications. Microservices are fine-grained, typically single-purpose, and loosely-coupled services facilitating easy and independent deployment and horizontal scalability. Microservices are self-defined, cleanly isolated, and autonomous, and intrinsically support the popular polyglot model. The polyglot paradigm represents multiple programming languages, data transmission protocols, and persistence mechanisms. The idea is to build and run highly reliable, scalable, available, resilient, message-driven, and secure microservices. Microservices are interoperable, technology-agnostic, and composable to produce process-centric applications. Microservices and the Docker-enabled containerization go hand in hand in agile software engineering and rapid IT service delivery. There are a variety of best practices, key guidelines, design and evaluation metrics, and enabling patterns being unearthed by many accomplished professionals in order to speed up the process of migration from monolithic workloads to microservices-based workloads. Besides, there are API gateways, integrated platforms for service integration and orchestration, deployment and delivery environments such as Docker containers, and so on for increasing the MSA adoption rate. Product vendors, system integrators, cloud service providers, DevOps engineers, and other IT professionals are teaming up for accelerating the use of services in realizing highly flexible, extensible, elastic, and sustainable applications. This chapter is dedicated to illustrating all the existing and emerging patterns in this new field for our readers.