The document provides an overview of linked data, including what it is, how to make linked data, and what can be done with linked data. It discusses several existing linked datasets for health care and life sciences like EntrezGene, UniProt, KEGG Pathway, and DrugBank. It describes how these datasets are published as linked data using HTTP URIs and RDF, and how they are interlinked. It also presents an example SPARQL query run across multiple linked datasets and the results. The document aims to promote the benefits of linked open drug data for applications like drug discovery.