How do inflatable airbags operate?

Airbags are termed supplemental restraints as they work with a number of other safety mechanisms within a car or vehicle. They operate by a series of steps to deploy the bag, first is that activation of crash sensors which being the engagement of the airbag, second this sends an electrical current to a squib, or inflater that casuses the igniter fluid to over heat and finnaly expands the airbag to take the impact of the passenger.