An aftermarket windshield is manufactured by different manufacturers other than the original creator of your car's windshield. They are often slightly cheaper than the originals and may or may not be built to the same standards as OEMs. Depending on the glass company's reputation, an aftermarket windshield may work just the same as OEMs. However, some do not abide by safety and quality standards, and you should take precautions when purchasing them. It would be best to consult an Auto Glass Repair such as American Windshield Replacement & Auto Glass for further guidance. We are available 24/7, so reach out to us soon!