Package tracking is a service provided by shipping companies that allows customers to monitor the status and location of their shipments. When a package is sent, it is assigned a unique tracking number, which can be used to access real-time updates on its journey from the sender to the recipient. Customers can use the tracking number on the shipping company's website or app to see where their package is at any given time. This feature helps ensure that packages arrive on time and allows users to plan for their delivery, providing peace of mind during the shipping process.