On the basis of possibility of movement of matter and energy in or out of the system.
a) Open System : It can exchange both matter and energy with its surroundings. e.g. tea kept in on open vessel.
b) Closed System : It can exchange only energy with its surroundings but not matter. e.g. tea kept in closed vessel.
c) Isolated System : It can neither exchange matter nor energy with its surroundings. e.g. tea kept in thermos flask.