The visitor data details depend on the data received from the show organizer. Whenever visitors register for their tickets, they will have to fill out their contact details (visitor data). Visitors have to give their consent that their details can be used. They also have the the possibility to opt-out, in that case, their details will not be available.
Exhibitor data details depend on the data received from the show organizer.
Note: As the Scan2Lead SMART app could be offline, please have a look at following article Why do I see "No visitor data" when scanning with Scan2Lead SMART?