The official Wikipedia app is a free and open-source encyclopedia that allows users to search and explore over 40 million articles in more than 300 languages. The app is ad-free and never tracks user data, as it is operated by the Wikimedia Foundation, a nonprofit organization that supports and operates Wikipedia. Users can customize their reading experience with text size adjustment and themes in pure black, dark, sepia, or light. The app also allows users to save their favorite articles and read Wikipedia offline with “My lists,” which syncs across all devices.<br/><br/>The app offers a variety of features to broaden users' horizons, including a customizable "Explore" feed that recommends Wikipedia content, a search bar that allows users to search within articles or using voice-enabled search, and the ability to search using emojis. Users can also send feedback from the app or contribute to the app's development if they have experience with Java and the Android SDK. The app automatically transmits crash reports to a third-party service provider, but users can disable this feature in the app's settings.<br/><br/>The Wikimedia Foundation is a charitable nonprofit organization that supports and operates Wikipedia and other Wiki projects. It is mainly funded through donations. The app's privacy policy and terms of use are available for users to review, as well as an explanation of the permissions needed by the app. Overall, the Wikipedia app provides a free and open-source encyclopedia that is accessible to users worldwide, with a variety of features to enhance the reading experience.