File created by Microsoft Publisher, a program used to create professional documents and marketing materials; contains raster and vector images, text, and drawn objects formatted in a document; used to create newsletters, brochures, posters, and other documents.
PUB files may also be used to integrate and store data sources for mail merges and generating data sheets.
NOTE: PUB files can be opened by LibreOffice Draw, which is packaged in LibreOffice.
File containing encrypted text that is used in public-key cryptography; used by a remote entity to encrypt data that only a local entity can decrypt using the corresponding private key; may also be used to decrypt data that is encrypted with a private key.
A common PUB file is id_rsa.pub. PUB files typically can be found under the ".SSH" hidden directory under the home director of a Linux user.