DOCX is a more modern version of the DOC text file format, which appeared in Microsoft Word 2007 from Microsoft. It takes its name from the full name of Microsoft Word Open XML Document. As in the previous version, DOCX format files contain not only textual information, but also tables, charts, images, and you can perform any formatting actions with the text. The main difference is that a DOCX text document is not a binary file, but a set of separate files (XML files, docProps, Word and _rels folders) in a ZIP compression package. This gives maximum file security without damaging or losing data.
ODT is one of the options for the text file format, which was in little demand and gained relative distribution only in 2014, when Google Docs began to use the ODF format. It takes its name from the OpenDocument Text Document, and is used in office programs that are based on utilities like Open Office or LibreOffice. The open standard ODF (OpenDocument Format) was created by the OASIS community and was intended for the free creation, editing, storage and exchange of office documents. Within its framework, the ODT format also allows the use of databases, presentations, images, tables in text files.