A URL Scheme is like "http://..." or "ftp://...". Those seem like a very low-level concept that you don't have much control over, but actually, you do! What sounds like an exotic topic is not so exotic at all: we are constantly using different URL Schemes, on any given day. For example when we're clicking a link to an iPhone app that launches the AppStore. Or when a friend sends us a link to a playlist and it opens in the Spotify desktop app.
In the following short tutorial, we'll look at how custom URL schemes work on macOS and iOS.