How are an ordinary xray, a ct scan and a mri scan different?

Complicated: I'll try to keep it simple: an xray is an image fromed when xray beams pass through the body from one direction creating the image at the detector on the opposite side of the body. Ct also use xrays, but the source and the detector(s) rotate around the body and a computer takes the resulting data and creates the image. Mri uses magnets to align all the body's protons.