The document discusses an IoT solution called RAQIB that was developed to help address challenges in monitoring and assisting pilgrims during the Hajj pilgrimage in Mecca. The solution involves wearable devices to track pilgrim location and health, a mobile app for family monitoring, and an emergency response system. It was tested during peak periods with thousands of pilgrims traveling between religious sites over just a few days with diverse languages and cultures. The solution aims to provide peace of mind by enabling quick response in case of emergencies or missing persons during the massive annual pilgrimage event.