How do microservices interact with each other?

Microservices interact with each other through network interfaces, exchanging data over standard protocols, most often through an API or a messaging system.

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#The main ways of interacting

1. Synchronous interaction (through an API) One service calls another directly and waits for a response.

• Protocols: HTTP/HTTPS, gRPC.
• Data formats: JSON, Protobuf. Example: the orders service requests user data from the profiles service.

2. Asynchronous interaction (through a message queue) Services do not wait for responses; they exchange events.

• Tools: RabbitMQ, Kafka, NATS. Example: after an order is created, the service "publishes an event", and the delivery service reacts to it.

3. Event bus All services subscribe to shared events ("new order", "payment confirmed") and react to them independently.

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#Why this is needed

• It minimizes the dependency between services.
• It increases resilience: a failure in one service does not block the rest.
• It allows communication to be scaled to fit specific scenarios.

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Summary:

Microservices communicate through API calls or events, choosing between a synchronous (waiting for a response) and an asynchronous (message-based) approach, depending on the task and the response speed needed.