More than a PDF reader
If you only want to open and read PDFs, you can now do this in your browser. There is no need for any extra software. Users who also want to edit, sign or comment on PDFs need to look around. The CHIP download charts are a good place to start.
The Foxit Reader strikes a good balance between useful applications and good operation, which gives you immediate access to the most important functions. Since the latest version offers important security patches, users should update quickly.