In Windows 7 it's called the Favorites toolbar. You add it to the taskbar and create a section you can put folder links in, with or without labels. Windows 10's

In Windows 7 it's called the Favorites toolbar. You add it to the taskbar and create a section you can put folder links in, with or without labels. Windows 10's version is called Links and it's utterly crippled in comparison. You can't put it on the left side of your other taskbar shortcuts and you can't remove the massive "Links" label that wastes space and does nothing.