I have read that the 是+...+的 structure is used for emphasis. I wonder in sentences describing colours like 这辆车是红色的, is the 是+...+的 structure used for emphasis too? What kind of 是+...+的 is this? Is 的 necessary in such sentences?
I really couldn't find much information about this kind of 是+...+的 structure. And I haven't found this structure except in sentences describing colours.