Kafka Connect is a tool used to integrate Apache Kafka with external data sources, such as databases, and provides a flexible way to bridge data silos in microservices architectures. It uses Change Data Capture (CDC) tools to read from the database's transaction log, extracting events at low latency and impact. This allows for real-time synchronization of data across multiple databases, enabling features like three-way database syncs for complex use cases. Kafka Connect solves problems such as handling different data types, destination database data models, and referential integrity issues, providing a flexible solution for integrating Kafka with external data sources.