At present, there are two versions of Acrobat in common use: version 2.1, and 3.0 in Beta release. Version 3.0 displays text better, and allows you to view PDF files more rapidly (on a slow connection) through Netscape 3.0 (if you get their plug-in). Please check Adobe's web site for current information and the technical requirements and suggested computer configurations. All new Macintoshes come with the Acrobat reader, but it may not be installed. You may want to check the disks that came with your machine to see if you have the reader already.