The WORD format most often means files created and saved in a text editor from Microsoft - Microsoft Word. Such files can have extensions .doc (DOC), .docx (DOCX), .rtf (RTF or Rich Text Format) and sometimes .txt (TXT). Editor versions from 97 to 2003 only supported the .doc extension. Beginning with Word 2007 and beyond (2010, 2013, 2016, and 2019), by default files are saved in the DOCX format — an enhanced version of DOC.
Today, the WORD format is the most common text file format. Its editing is supported in most popular text editors (WordPad, Google Docs, etc.). Features of this format allow you to store not only text but also many other elements - tables, images, and even videos.