Where do the manufacturers use a magnetic strip in the refrigerator? Why is this magnetic strip used?

The manufacturers use a magnetic strip in the doors of the refrigerator.

Magnetic strips are used in the doors of the refrigerator to keep the door closed properly.

If the magnetic strip would not be used in the door of the refrigerator, then the door will not close completely, due to which warm air from outside will enter into the refrigerator, and also the cool air from the refrigerator will escape.