The video shows a person demonstrating how to use a trunk liner in a car. The person is seen opening the trunk of a red car and then placing a black trunk liner inside. The liner is then secured in place by folding it over the edge of the trunk and securing it with the built-in straps. The person then proceeds to show the storage compartments and pockets that are built into the liner, demonstrating how it can be used to organize and protect the trunk of the car.