What is coach Mark UI?
Coach marks are temporary messages that educate users through new or unfamiliar product experiences. They can be chained into a sequence to form a tour. View component.
What is an instructional overlay?
The use of instructional overlays (IO) or coach marks is a technique used to guide users to where these features are located in the interface by using a darker layer superimposed to the interface (overlay) where elements are placed such as arrows and text (instructional elements).