On the World Wide Web, deep linking refers to a URL pointing to an internal path of a website rather than its root domain. If you visualize a website as a set of HTML files stored into a tree of folders, a deep link is the path to a file in a subfolder.
In reality, deep links are just links. The only difference is that they lead to a specific resource, such as a product listing page or product details page on an ecommerce website. Most marketing campaigns require deep linking to subpages rather than the homepage, since the more specific the landing page, the more effective the campaign.
In the case of an international brand, linking to a specific page without knowing the customer's location can be challenging. In fact, it is impossible to determine the country/language subpath of a specific page without a proper country selector or geocoding mechanism, so marketers do not know which product page to use for their international campaigns.
A possible solution to this problem is to build an intermediate link or a vanity URL that implements geocoding before redirecting the customer to the correct page.
Geocoding can be automatic, based on the IP address, or manual, based on the customer selecting their country specifically, which can be stored as a cookie for subsequent visits. Using this strategy, deep links can be shared into posts on social media, global marketing campaigns, or on any media with an international audience that you can't predict in advance.