The door glass is an integral part of the door.
The door has a section of glass, which makes up the door window, which can be opened or closed by the person, either manually or electronically. If the windows in the car are electronic, the driver will be able to control all of the windows from his/her seat.
The door glass is held in place when the window opens or closes by track assemblies which assists with the smooth operation of the window, and sealed with window rubber seals which function to firmly seal the door window with the door flange to stop water, dust and other particles or air coming into the car. Door glass used in modern cars is generally safety glass which decreases the chance of injury if it smashes.
Whether the model> door glass has been smashed, cracked, chipped and needs replacing due to general wear and tear, or you are simply renovating your car, it's important when replacing your door glass that you purchase the door glass that is compatible with the make and model of your car so that it fits into the door frame correctly. It is important that you buy the right replacement glass, so if it's the passenger side front door glass that needs replacing, it's imperative that you purchase the door glass to fit on to the door.