We should also note that “routine” has a very specific meaning in the SmartThings environment. They are multi device actions that you can set up that can also be displayed as a widget on your phone or watch. Only routines have the widget option.
That said, there are also many other ways to create schedules, rules and automations in SmartThings. So if you were asking in a more general sense, you might also want to take a look at this: