This document discusses databases and data modeling. It begins by defining what big data is and how databases underlie digital products. It then discusses how the digital humanities deals with large amounts of digitized information sources. The document goes on to explain how databases can be used to ingest and combine data sets to create new data. It also discusses how databases allow for inferences to be made through relations between tables. Finally, it covers database design, including creating entity relationship diagrams to model data and mapping those diagrams to database tables.