Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Portable Document Format or PDF is the most widely used format for sending and receiving documents these days. Being an open standard for document exchange, PDF support has been incorporated in many Linux distributions by default. Also, the popularity of the format has even convinced Microsoft to include PDF support in the upcoming version of Windows.
Earlier, many people had to rely on the closed-source Adobe PDF reader for accessing PDF documents. However, thanks to the hard work of many software developers, we have plenty of tools to do that.