Similar to PPP but older. For most people, neither is too appealing. On the Internet, it refers to unsolicited mailing of messages to e-mail address or newsgroups. This is the way in which computers communicate on the Internet. TIFF formats were originally developed by Aldus and Microsoft corporations.
People can post a message, comment or question to which others can post their response.
You would not be able to see these type of files without using an external program. Your Mileage May Vary.