Linux has quite a few PDF readers available, but Okular stands out as the best of the bunch, due to its ability to comment on, highlight, and otherwise annotate PDFs.
The PDF (portable document format) standard was created in the 1990s by Adobe cofounder John Warnock to make it possible for people to share reliably formatted documents across a wide range of ...
These days, you don't need an app just to view PDF files. Every web browser can do that. If you sometimes create PDF files out of Office documents, you probably use Adobe's Acrobat Reader. After all, ...