An application known as "data selling" allows users to sell their personal information to companies and organizations in order to make money off of it. These applications gather and compile user data fromrummy sites a variety of sources, such as browsing history, app usage, location information, and purchase patterns. After anonymizing the data, it is packaged and sold to potential customers. Consent-based data selling apps let users decide which particular data points are shared with outside parties. Users have control over their personal information and transparency by being able to opt in or out of data sharing.