Definition
Microservices (or microservices architecture) is an architectural style that structures an application as a collection of services that are highly maintainable and testable, loosely coupled, independently deployable, and organized around business capabilities.
Why It Matters
Monolithic architectures often become ‘big balls of mud’ where a single bug can crash the entire system and deployment speed slows to a crawl. Microservices allow for independent scaling and failure isolation, which is essential for modern, high-traffic applications that must evolve rapidly without catastrophic downtime.
Core Concepts
- Decomposition: Breaking a monolith into smaller, focused services.
- Independence: Each service can be developed, deployed, and scaled independently.
- Polyglot Persistence/Programming: Different services can use different databases and languages as suited for their specific task.
- Inter-service Communication: Services communicate over a network, typically using REST APIs, gRPC, or message brokers.