# 5. Data and Persistent Storage This module will deal with persistent storage to the Android phone, as well as storage across an application session (from open to close of an app). These topics will be particularly useful for developing applications that are client facing, though you will see in the future that most meaningful application data is stored online rather than locally. ### Topics * Shared Preferences * Rooms * Entities * Data Access Objects * Databases --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://android-course.cornellappdev.com/chapters/7.-persistent-storage.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.