Data and big data in healthcare are both important and topical. Big data has the potential to transform how we provide healthcare but can also be problematic. There can be problems with how data is captured, cleaned, and corrected or with how we update data. BMJ is playing an increasing role in this field. We have our own BMJ Data Set which provides AI healthcare technologies with current, credible, and AI-ready content. In this BMJ Best Practice podcast on healthcare and data, Kieran Walsh talks to Professor Dipak Kalra, President of The European Institute for Innovation through Health Data.