Data file used by EndNote, an application used for managing bibliographies; contains a collection of citations, each of which store author, year, title, journal, and other reference information; can also contain links to actual publications, such as .PDF files, for viewing in the software; used as the EndNote native save and load format.

EndNote libraries are often used by researchers and writers during the journal article authoring process. The citations in ENL files can be output to bibliographic publication format in the software. NOTE: ENL files are stored with a folder that has the ".Data" name extension. This folder is saved in the same directory as the ENL file and contains the database of information for the library.