Big users of PDF are the federal and state governments, many large companies and some newspapers. This is very important if you need specific government forms such as from IRS, Immigration and Naturalization, etc.
Newspapers use it to create exact copies of what their original pages looked like.
This program is essential to anyone planning on downloading shareware and many other type documents from the Internet. These programs are very handy if you like to keep up with your friends and when they might also happen to be online at the same time as yourself. Unlike email, these programs will let you know when they are on and you may then initiate real-time communications with them. You do NOT have to be an AOL member to use this. One of the best new free products allows you to use multiple search engines to search the web and then store the results for later use.