Plain Text refers to a type of file format that is character-based and does not contain any formatting or design elements. It consists only of plain, unformatted text characters without any additional information such as fonts, colors, images, or other non-textual elements. This makes it easy for users to read, edit, and share the content since there are no extra features that could interfere with its functionality. Plain Text is commonly used in computer programs, emails, and web pages where formatting may be stripped away during transmission or processing.