Can any one tell what is difference between cooperative game and multiplayer game?
Multiplayer games simply have multiple players playing the same game at the same time. Usually in our day and age, "online" is assumed when one mentions multiplayer, although this is not always the case.
Cooperative games typically feature multiplayer elements, but are typically focused on a subset of multiplayer games where the overall goal is to work together, usually against a non-human opponent.
Coop is usually split screen where two or more people are playing on the same device and multiplayer is gaming online with people around the world similar to Xbox Live