Smart keys for cars have almost entirely phased out regular keys. Though not perfect, smart keys have a lot of benefits, and they work in an interesting way.

The campaign, which the company says is its most substantial advertising initiative in recent history, touts SmartKey re-key technology, designed to let home owners re-key their locks.

Cars have had smart keys for quite a while now, and they have almost entirely phased out regular keys. What are smart keys, actually? How do they work?