Is ddr computer ram for nokebook computer or we can use in desktop computer?

There is two types. There is DDR notebook RAM and there is DDR desktop ram. They can't be used vin each other (notebook RAM can't be used in a desktop) unless (in rare circumstances) you happen to have a notebook ram port on your desktop's motherboard.

But no, DDR is a technology. Both desktops and notebooks support this technology because there is notebook DDR and desktop DDR. but notebook DDR can't be put in desktop DDR and vice versa.