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Microservices can communicate using five key patterns based on their needs.

Dependency failures can disrupt applications, but resilience patterns can help manage them.

Distributed tracing helps track requests across microservices to find delays.

Request-Response asks for a result, while Events notify that something has happened.

Message queues allow services to communicate asynchronously, improving scalability and reliability.

Database per Service ensures each microservice owns its data, reducing dependencies.

The Saga Pattern manages distributed transactions using local transactions and compensating actions.

Microservices are useful when you need independent scaling, deployment, and clear boundaries in software design.