A Practice Note discussing privacy considerations in the context of mobile applications (apps), including liability risks associated with mobile app information collection and practices for addressing those risks. This Note provides an overview of how mobile apps use technology to collect information about and track end users and identifies key differences between how mobile apps and websites collect and store end-user information and how end users can control that collection and storage. It also discusses the legal framework governing mobile app privacy, including FTC rulemaking, guidance, and enforcement actions.