Mobile user onboarding is the practice of guiding first-time users through a mobile app, helping them understand its features and find value within their initial interactions. Effective mobile onboarding considers user behavior patterns exclusive to mobile experiences, such as shorter attention spans and less screen real estate. Best practices for mobile user onboarding include micro-interactions, gamification, and self-discovery. Adjusting the messaging and design for mobile is crucial in delivering engaging onboarding experiences. Tools like Airship, Appcues, Braze, Chameleon, and Pendo can help improve mobile onboarding processes.