Your cat's a cat of no particular breed - just like over 97% of the cats on this entire planet. Cats were domesticated THOUSANDS of years ago and breeds only established in the last 100 or so. So most cats aren't a breed or even a mix of breeds - they're simply domestics.
The colour of your cat is called "Tortoiseshell" or more commonly, "Tortie". When white's added then it's "Calico" or "Tortie and White".