.RTF File Extension Description:

File extension RTF is the rich text format file. It is one of the most common files and in fact originates from the abbreviated title, Rich Text File. Its common nature implies that it is a file that is utilised in a number of different ways. It is thus used to store or share different content in addition to providing users with the ability to create content including different features. Furthermore, it allows the transfer of text documents between a variety of word processing applications as Open Office and Microsoft Word just to mention but a few.

Learn more here: http://rtf.file-extension-library.com/