Fivetran is a cloud-based SaaS company that provides database replication services, enabling customers to replicate data from production databases into data warehouses for analytics. The company uses logical replication with change data capture (CDC) to replicate data in real-time, reducing the impact on system resources and enabling faster database migrations with minimal downtime. Fivetran supports various methods of CDC, including log-based, trigger-based, timestamp-based, and difference-based approaches, and is used by several major companies such as Autodesk, Pitney Bowes, and JetBlue. The company's solution allows for incremental identification of changes at the source and reproduction of corresponding updates in the destination, making it an ideal choice for organizations that require real-time data replication and synchronization across multiple systems.