Wouter Schallier discusses the importance of open data and the role of libraries. As research becomes more data-intensive and collaborative, data must be shared, preserved and made usable. However, many challenges remain regarding data storage, organization, and ensuring proper usage. Libraries are well-positioned to take on the role of preserving primary research data and helping make it accessible, but will need more resources to handle the complexity and size of research data collections. Open data sharing stands to advance science through transparency and reuse of data.