What is a schema in the context of microservices?

In the context of microservices, a schema is a formal description of the data structure that services exchange with each other. It defines the message format, field types, mandatory fields, and constraints, ensuring consistency and compatibility between services.

Schemas help to:

• Avoid errors during data serialization/deserialization.
• Ensure backward compatibility when API changes.
• Automate validation and code generation.

Formats like JSON Schema, Protobuf, or Avro are often used to describe schemas. For example, if one service publishes an event with a specific structure, the schema guarantees that consumers can process it correctly.