Questions about tracking

I know nothing about user experience but am intrigued about tracking and have some questions about it. By tracking, I mean how users can track for example their package, or their pizza delivery. Who is responsible for creating and designing these - are their companies that specialise in it? Do businesses outsource these to such specialists? Or is it something a business can easily do itself? Is this a field of study within user experience itself? How can one go about learning how such tracking is designed a