Microsoft Office 365
Microsoft Office 365 is optimized for mobile productivity with streamlined tools for creating, editing, and sharing documents.
Microsoft Word was developed by Microsoft as a desktop application, but it is also available for smartphones officially. It is part of Microsoft Office 365, but you can download it as a standalone app as well. It is a freeware app while offering free and subscription plans as well.
It allows users to reliably view, edit, and create documents without waiting for their computer. It not only offers a typing of document facility, but also manages multiple important workflows such as teaching & training, client communication, broader document management, and so on.