Adobe Acrobat is a portable document format that incorporates facilities for preserving page layout information, fonts, graphics, etc. While some advanced Acrobat facilities are available only with commercial versions of the Acrobat products, Adobe has made available basic Acrobat readers for free redistribution.
For the most current information about Acrobat, see Adobe's Acrobat Home Page.
Look here for Adobe's information on downloading free Acrobat readers. An alternative link shows the many available versions.
If the above links are busy, you can try a mirror site such as the one at Ambia, or the one at Emerge, or other Adobe sites in Germany, U.K., or elsewhere.
Some browsers can make use of the Acrobat reader to display Acrobat files in their own window. For other browsers, you need to link the Acrobat reader to your browser as a helper application. Consult these instructions from Adobe, or these, or these, or these.
As a last resort, you can download our byte-identical copies of files from Adobe's Acrobat 2.0 CD Sampler. (Adobe allows unlimited redistribution of these files.) However, these files are not as current as the ones that you can get directly from Adobe or from a mirror site, and we can provide no assistance in installing them! (Mac users will need a BinHex conversion utility.)
Acrobat is a trademark of Adobe Systems Incorporated.