VARIOUS fonts, fonts sizes, FONT styles, paragraph styles, etc). They may also contain non-text content such as images. File formats USED for rich text documents include RTF, DOC and DOCX.On the other hand, plain text documents contain only plain, unformatted text. Plain text files are usually saved using the TXT filename extension.A few of the text file extensions are given below:File TypeExtensionText.CSV (Comma Separated Values) - a file commonly used by spreadsheet programs such as Microsoft Excel, contains plain text data sets separated by commas..RTF (Rich Text Format) - introduced by Microsoft in 1987, a common text file format that supports "rich text.".TXT - is a standard text document containing unformatted text, useful for storing information in plain textVideo.MP4 (MPEG4) - earliest digital video file formats, can store audio files, video files, still images, and text, relatively small file sizes.AVI (Audio Video Interleave) - introduced by Microsoft, uses less compression than other video formats, very large file sizesAudio.MP3 - an audio file saved in a compressed audio format developed by the Moving Picture Experts Group (MPEG), used to store music, but may also contain other types of audio contentImage.JPEG (Joint Photographic Experts Group) - standardized image compression mechanism designed for compressing EITHER full-colour three-band (RGB) or grey-scale one-band images..GIF (Graphics INTERCHANGE Format) - limited to an 8-bit or 256 colours, store simple graphics, logos and cartoon style imagesDocument.PDF (Portable Document Format) - created by Adobe Acrobat, used for saving documents and publications in a standard format that can be viewed on multiple platforms Hence, it can be concluded from the table that CSV, RTF and TXT are text file formats.