Final answer:
An open system allows matter and energy to be exchanged between the system and its surroundings, while a closed system can only exchange energy.
Step-by-step explanation:
An open system allows things to come in and out. This means that matter and energy can be exchanged between the system and its surroundings. For example, a pot of boiling water is an open system because it can exchange energy in the form of heat and matter in the form of water vapor with its surroundings. On the other hand, a closed system can exchange energy but not matter with its surroundings. An example of a closed system is a sealed pouch of a ready-made dinner that is dropped into a pot of boiling water. It can only transfer thermal energy from the boiling water but no matter is exchanged.