Rich Text Format (RTF) is a file format that can be read by different apps, but it’s different from text format (.txt) in that you can add certain stylings to your text, such as colors, bolding and italics. Plain text documents look the same no matter what word processing app you open them up in. RTF documents can look different when read in various programs. Ensure you don’t create a rich text document by mistake when an employer requests a plain text resume.