How is communication organized between microservices?

Communication between microservices is organized using several main approaches:

1. HTTP/REST API — the most common method, where services exchange data via HTTP requests using JSON or other formats.

2. gRPC — an efficient protocol based on HTTP/2 with support for binary serialization, suitable for high-performance interactions.

3. Messages through brokers (RabbitMQ, Kafka, NATS) — asynchronous communication where services exchange events or commands through message queues.

4. Direct TCP/UDP connections — less common, used for specific tasks with low latency.

In Go, standard libraries like net/http for REST, google.golang.org/grpc for gRPC, and message broker clients are often used for implementation. The choice depends on performance requirements, reliability, and system architecture.