The integration of Hightouch with PlanetScale allows users to easily sync data between multiple platforms using simple connections. The power of this combination can be used in various ways, such as automating customer records updates, sending notifications, executing asynchronous operations, and syncing account health scores. To use the integration, users set up a sync by configuring a data source, destination, and sync method in Hightouch, with PlanetScale serving as either a source or destination for the syncs. Users can map fields between different systems, allowing for seamless data transfer without requiring matching field names.