For example, five stars do not always add up to six or more airbags. Some car makers provide only enough (four) airbags to earn the five-star rating.
For complete peace of mind, be sure to check there are two front, two side (usually in the outer cushion of the front seats) and two head-protecting "curtain" airbags that drop down from the roof above the side windows - front and rear.
Some cars have knee-protecting airbags under the steering column and near the glovebox, while others also have rear-seat airbags.