Microservice architecture, scalable system, cloud computing, multiple servers, load balancer, API gateway, service discovery, circuit breaker, distributed database, message queue, event-driven design, real-time data processing, containerization, Docker, Kubernetes, high availability, fault tolerance, modular design, loose coupling, abstraction layer, interface segregation, single responsibility principle, open-closed principle, layered architecture, client-server architecture, peer-to-peer architecture, RESTful API, GraphQL API, gRPC, event sourcing, CQRS, Domain-Driven Design, hexagonal architecture, onion architecture, clean architecture.