A tutorial for putting a 3d model on a picture?

Im not sure if i can explain myself correctly…

what i want to do is like take a picture of somewherem then i want to add a 3d object so it looks like its there, ive seen it done in some other places but i dont know if theres a name for doing this…

any tips on how to do it? so it looks like its got correct dimentions and everything


sorry for bad english

are you thinking of compositing?