types of sampling

im kinda of confused about sampling. so my question is when you are sampling a song and you chop up lets say some horn hits from a song and assign them to pads and play out a new melody out of them this is sampling right? But wat about producers that just take little bit of a song and dont recreate a new melody but just reply the whole thing and maybe change it a little (like pitch or other instrument) is this sampling aswell?

Any help would be great and sorry for the newbie question, im just trying to get my head around sampling