Microsoft Word, part of the Microsoft Office Suite but also sold as a standalone application, is Microsoft's word processor. Its proprietary (but open-specification) DOC format is considered a de-facto standard, although from 2007 and above, Word uses DOCX.
Other features include SmartArt, PDF support, and feature searching (as of Word 2016).
Word Online, part of Office Online, is the web client with a limited feature set. More Info »
Using the mobile app, an Microsoft Office 365 subscription is required to create and edit documents with a screen size of 10.1 inches or larger; documents will be opened in read-only mode.