The document discusses how mobile apps can be used to support key HR functions. It describes features for recruiting, onboarding, performance management, learning and development, payroll, core HR, leave management, time and attendance, approvals, scheduling, employee self-service, manager self-service, company communication, and help desk tools. For each function, it provides usage statistics, key mobile features, and mockups of device-specific features like push notifications and location services. The overall document examines how a mobile HR app can enable employees to access HR services anytime from any device.