The document discusses the importance of mobile app maintenance. It notes that building an app is not just development and deployment, but also ongoing maintenance to improve the app based on user needs. It outlines different types of maintenance like emergency, perfective, adaptive and preventive maintenance. It provides best practices for maintenance like regular updates, monitoring the app, license checking and scheduling maintenance. It also discusses factors to consider for maintenance costs like analytics, hosting, third-party integrations, bug fixes, marketing, client support and security.