When your windows are installed, the glass panels are held in place by a sealant. The sealant is an adhesive that sticks your glass panels to the window frame. If this sealing material is damaged, your glass may become easily cracked or chipped.
In addition, you may end up leaking lots of air from your home and driving up your heating and cooling costs. This is why it's important to keep an eye out for the signs of damaged sealant.