About PDF Tools
PDF Tools is, among other things, a replacement of DocView for PDF files. The key difference is that pages are not pre-rendered by, say,
ghostscript and stored in the file-system, but rather created on-demand and stored in memory.
This rendering is performed by a special library named, for whatever reason,
poppler, running inside a server program. This program is called
epdfinfo and its job is to successively read requests from Emacs and produce the proper results, i.e. the PNG image of a PDF page.
Actually, displaying PDF files is just one part of
poppler can provide us with all kinds of information about a document and is also able to modify it, there is a lot more we can do with it. Watch this video for a detailed demo!