A push button start is a keyless ignition system that is used in some vehicles. This type of system uses a button to start the engine instead of a key. There are several benefits to having a push button start. One benefit is that it can prevent theft because the car cannot be started without the button. Another benefit is that it is more convenient than using a key. You do not have to worry about losing your keys or having them stolen. The downside to having a push button start is that if the battery dies, you will not be able to start the car.