How are the boundaries between microservices divided? What does each service do?

Boundaries between microservices are usually defined by business functions or contexts (bounded contexts). Each service is responsible for a specific set of tasks and data, minimizing dependencies on other services.

For example, in an online store, the following services can be distinguished:

• User service: registration, authentication, profile management.
• Catalog service: managing products, categories, descriptions.
• Order service: creating and processing orders, delivery status.
• Payment service: processing payments, refunds.

Each service has its own database and API for interaction with other services. This allows for independent development, scaling, and deployment of services, reducing coupling and increasing system fault tolerance.