A document reader application designed for the Android operating system allows users to access and view various file formats, primarily those associated with text documents. These applications enable users to open, read, and sometimes edit files such as PDFs, DOCs, DOCXs, TXTs, and RTFs on their mobile devices. An example would be an application on a smartphone that allows a user to read a PDF contract sent via email.
The utility of such an application stems from increased accessibility and convenience. It eliminates the need for a physical computer to view documents, facilitating productivity while mobile. Historically, document viewing on mobile devices was limited due to processing power and screen size. As technology advanced, mobile devices became capable of handling larger files and displaying them effectively, resulting in the development of specialized document reader applications.