Sending package to another country can be very tricky because different countries apply different rules on sending and receiving package. Despite the different rules, most countries are actually applying the same rules such as no drugs and not trading rare and endangered animals. According to https://trackingshipment.net/canada_post, there are three types of services that people are using: the transaction mail, parcels, and direct marketing; and the international package tracking service has the ability to track all those three.
Why would people track their package? Well, the first reason would be safety reason because in the modern era of the internet, some people are finding that online shopping is far more convenient than have to go to the store, pick the items, and have to wait in line on the cashier. So when people are shopping online, they want to make sure that their items that they have bought will be delivered safe and sound right in front of their door step.
For your information, the tracking is also part of the insurance option because all packages must be handled with care; even if the package says that it is clothes or non-fragile items, it should be handled with care. With the online tracking option such as the https://trackingshipment.net, the buyers or the recipients can estimate the TOA of the package or time of arrival.