BDC is a cloud-based ecosystem offering researchers data, analytical tools, applications, and workflows in secure workspaces where researchers can find, access, share, store, and compute on hosted data or data they bring to it. BDC is also an NHLBI data repository where researchers share scientific data so they and others can reproduce findings and reuse data to advance science. The TOPMed Imputation Server, where researchers can upload their own phased or unphased GWAS genotypes and receive phased and imputed genomes in return, is also part of the BDC ecosystem.