How does push-button start work on cars?

Push-button start is standard on most modern cars, trucks and SUVs today. How does it work and is it better than ignition keys?
The Daily Dot

‘Toyota will soon make that a subscription service’: Toyota customer shows how to remote-start your car. All you need is a key fob and a little trick

Modern cars have a lot of conveniences—interactive infotainment, maps, advanced safety systems, and even autonomous driving. All of these newer additions make a remote-start with a key fob seem like ...