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

thanks

sorry for bad english

are you thinking of compositing?

https://blenderartists.org/forum/viewtopic.php?t=48057&postdays=0&postorder=asc&start=0