Styropor vs Styrofoam

It is funny how I come up with this post. At work we were discussing what to do with our bulletin board. Other teams already started decorating their board with Christmas themes. One of my team mate suggested to use a Christmas background that he saw online. It has a light blue background with snow on the side and a white christmas tree. He said we can change the background to black then use styropor or styrofoam for the snow?

Hahaha! I asked him to search in google the difference between the two. Guess what, we find out that Styrofoam and Stryopor are actually brand names and the material is actually called polystyrene. It is like photocopier which is more known as Xerox (brand name of photocopier).