Kiosks are information points that are often in the public sphere and because of this they have to be durable and withstand high traffic usage. Because the general public includes everyone, kiosks have to be very easy to use, and this is why touch screens are perfect for using with Kiosks.
The software running on the kiosk recognises parts of the screen as buttons that activate other functionality. The screen can contain as many ‘buttons’ as you need. Because there are no mechanical keys to press, it means that there is less hardware on the machine that could get damaged during day to day use. Therefore flat screen kiosks save money because they have fewer mechanical inputs which could be vandalised or misused.