SmartThings uses what they call “Hello Actions” or phrases as scenes. The actions can be used to turn on/off stuff and also change the Mode. Mode is essentially the state of your home and can be triggered by the actions or other SmartApps. The actions can be found by hitting the bubble icon in the top right corner of the mobile app (for Android at least) and you can add new ones by hitting the gear icon next to “Change mode and more”. The Modes can be edited/added by Dashboard → gear icon → Modes.