Difference between OEM and regular os in a box?

Question

I just need to know why oem is cheaper what am I

Missing out on with the OEM

Answer 1

Packaging and end user support levels, that's about it!

OEM stuff is for Original Equipment Manufacturers, the people who build you a PC and sell it on and then take on the responsibility of support for your PC. You can buy it too though, but usually have to buy an item of hardware with it.