How do microservices interact with each other? Via HTTP requests or asynchronous interaction?

Microservices can interact either through synchronous HTTP requests or through asynchronous mechanisms, such as message queues (RabbitMQ, Kafka, etc.).

• HTTP requests are convenient for simple, quick requests with immediate responses, where synchrony and ease of implementation are important.
• Asynchronous interaction is used to improve fault tolerance, scalability, and reduce coupling between services. It allows services to exchange messages without waiting for a response, which is useful for event processing, background tasks, and integration.

The choice depends on system requirements: a hybrid approach is often used, where critical requests are made via HTTP, and events and background processes are handled through asynchronous queues.