If a rock or other flying item has damaged your car's side or rear window, you can patch them up with a little bit of tape. It's not a permanent fix, but it'll get you home or to a repair shop.
Have your assistant climb into the vehicle and sit opposite the broken glass to apply positive pressure when you try to secure the glass. Be sure the assistant is wearing gloves to protect cuts and scratches from broken glass.
Peel off a strip of tape about the 3 inches longer than the crack and cut if off using the scissors. You want the tape to go beyond the cracked section to give it a strong foundation.
Lightly apply the tape to the window, one edge at a time and slowly working your way along the crack. Have your assistant hold the inside of the window so you can apply a small amount of pressure along the crack to secure the tape.
Apply one strip of tape to each side of the tape over the crack, overlapping the tape by 1/2-inch at a time. That will add to the strength of the first strip of tape.
Move to the inside of the vehicle and repeat steps 3 and 4 on the other side of the glass. That will help to keep things as strong as possible until you can have the damaged window replaced.
Do not use this method to fix a broken windshield. The windshield is critical for driving, and if it's broken, it needs to be professionally replaced immediately. Tape is only a temporary fix; have the window replaced as soon as possible. You may get a ticket for driving with broken windows, so check your local laws before applying.