Microservices architecture is a design style where an application is composed of small, independent services that communicate over a network. Each service focuses on a specific business capability and can be developed, deployed, and scaled independently. This approach contrasts with monolithic architecture, where the entire application is built as a single, interconnected unit.
Differences:
- Modularity: Microservices promote modularity, allowing teams to work on individual services/ domains without affecting others. In monoliths, any change often requires testing and redeploying the entire application.
- Scalability: Microservices allow scaling specific parts of an application independently, while a monolith usually scales as a whole, which can be inefficient.
- Technology Stack: Microservices enable using different technologies for different services, whereas monolithic architecture typically uses a unified tech stack.
- Resilience: Microservices enhance resilience by isolating failures to individual services. If one service fails, the rest of the system can still function. In a monolithic system, a failure could bring down the entire application, creating a single point of failure.

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