||Rich Text Format (RTF) is a file format that enables you to write a text file, save it on one operating system and then have the ability to open it on another. You cannot add images or objects - it is purely aimed at text. You can create a file using Microsoft Word in Windows, save it as an RTF file (it will have a .rtf file name suffix), and send it to someone who uses WordPerfect 6.0 on any version of Windows and they will be able to open the file and read it. Most people would have seen it when writing a 'wordpad rtf' file.
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||The RTF Specification uses the ANSI, PC-8, Macintosh, and IBM PC character sets. It defines control words and symbols that serve as common denominator formatting commands. When saving a file in the Rich Text Format, the file is processed by an RTF writer that converts the word processor's markup to the RTF language. When being read, the control words and symbols are processed by an RTF reader that converts the RTF language into formatting for the word processor that will display the document.
||More detailed information on RTF files
What free programs can I use to open an RTF file ?
Convert RTF file