How can we turn Android tablets into kiosks?

Can anyone help me to turn Android tablets/smartphones into Kiosks?

Can you explain the question?

you can actually turn your android tablets into kiosk but having a custom application running on it for your products / services offered or if you are a developer use can create a custom OS with kiosk UI software and can install as a root UI - OS to use as a complete kiosk without any external application installed.

I just to know How can we turn Android tablets into Kiosk mode ( restricted mode).