API is short for Application Programming Interface. APIs enable two programs to transmit information to each other by using a set of definitions and protocols. This involves sending requests and receiving responses. For example, Meta's system stores ads; when you're browsing Instagram posts on your phone, you can see some ads. This is because Instagram sends requests to the system via APIs and shows you the latest ads.
A tracking API is especially used to facilitate domestic and international parcel tracking. It allows your customers to access the up-to-date shipment status and to learn about the details and events right from your e-commerce website by using a tracking number. Such functionality can bring back customers to your site and lead to more sales. To date, an increasing number of market players are offering parcel tracking services via tracking APIs to improve customer experience, as well as increase return traffic and sales.