The Cochrane Library is a collection of databases in medicine and other healthcare specialities that contain different types of evidence to inform healthcare decision-making. Data in the Cochrane Library comes from the Cochrane Database of Systematic Reviews (CDSR), the Cochrane Central Register of Controlled Trials (CENTRAL), and Cochrane Clinical Answers (CCA). The Cochrane Library uses a subscription-based model, with many governments purchasing country-wide access. A more limited version of the Library is available for free.