Other Types of Databases
The relational database model is the most used database model today. However, many other database models exist that
provide different strengths than the relational model. The hierarchical database model, popular in the 1960s and 1970s,
connected data together in a hierarchy, allowing for a parent/child relationship between data. The documentcentric
model
allowed for a more unstructured data storage by placing data into “documents” that could then be manipulated.