The bezel is the entire front of the PC as shown in this eBay listing. And yes it is basically a cosmetic look.
1- Do I understand correctly that the term 'bezel' refers to the front of the case, and specifically the part above the grill?   [IMAGE]   2- Some bezels have an optical drive, some don't. Aside from that, are the differences between bezels (like Night Sky and Platinum Silver) purely cosmetic - just for looks?
XPS 8950 Bezels ... Only Cosmetic?