The Brainliest Answer!
solid-the arrangement of molecules is very tight or fixed and the molecules does not move
           eg:solids like clock,brick etc
liquid-the arrangement of molecules is not tight as in solid but little loose.
           eg:liquids like water,oil,milk etc.
gas-the arrangement is not there in gases as such and they move about freely.
           eg:nitrogen,oxygen and other various types of gases etc
And also plasma is another state of matter but only the 1st three are important

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Thanks... Could you add more of the differences :)
i have added some.just see to it..........
plzzzzzzzzzzz mark it the best
thanks a lot!