A data subscription is an annual subscription that allows you full access SuperSearch and Record Matches.
SuperSearch is MyHeritage’s research tool that allows you to search in approximately 5 billion records from around the world. SuperSearch includes exclusive records from all over the world that, in most cases, are only available on MyHeritage.
Record Matches automatically matches the people in your family tree to the billions of records in SuperSearch and notifies you of matches. A data subscription allows you to confirm or reject matches, view records and download them.
Data subscriptions is offered on a yearly basis. Here’s a link to view subscription prices.