Ignition is the act of starting a reaction.

• In chemistry it refers to heating a material to the point that it spontaneously combusts.
• An ignition system is a method for activating and controlling the combustion of fuel in an internal combustion engine. For a car, it is initiated by turning the car's key in a lock to start the engine.
• Ignition was a hip hop song by R. Kelly.
• Ignition is a humorous racing game for PC published in

1997 by UDS.

• Ignition Entertainment is a computer video games company founded in founded in 2002 which is currently focusing on games for the Nintendo DS and Sony PSP