Explain the concept of Debezium and what it is used for in data processing systems.

Debezium is a platform for implementing Change Data Capture (CDC), which allows tracking changes in databases in real-time and streaming them to other systems.

The main idea of Debezium is to monitor transactional logs of databases (for example, binlog in MySQL, WAL in PostgreSQL) and transform changes (inserts, updates, deletes) into events that can be transmitted to data processing systems such as Apache Kafka.

This is useful for:

• Data replication between systems
• Implementing microservice architecture with data synchronization
• Building analytics and monitoring systems
• Ensuring data consistency in distributed systems

Example: when a record in the orders table is changed, Debezium captures this change and sends an event to Kafka, from where other services can process it and update their data.