Courier tracking is a system that enables customers to monitor the progress of their parcel or shipment as it moves from the sender to the recipient. This service is provided by courier companies through an online platform, which typically requires a unique tracking number or identifier. By entering this number on the courier company's website or mobile app, customers can receive real-time updates on their shipment's location, status, and estimated delivery time. This tracking system allows for increased transparency, efficiency, and customer satisfaction in the delivery process.