In Brightway2, collections of inventory data are called databases. Some such collections have lots of datasets, such as ecoinvent or the US LCI database, and some, like those made for a specific LCA, have only a few datasets.

SimaPro distinguishes between libraries, which come pre-installed, and projects, which you make yourself. Here is an interesting tip for Simapro users who want to know what libraries are referenced by their current project: delete your project.