What’s a state? Let’s use the example of the states of matter: solid. liquid, and gas (we’ll ignore plasma to keep this simple). There are well defined transitions to move between these states:
melting transitions from solid to liquid,
freezing transitions from liquid to solid,
evaporating transitions from liquid to gas,
condensing transitions from gas to liquid, and
sublimating transitions from solid to gas.
Each of these have conditions in terms of material, temperature, and pressure that control whether or not the transition can happen. A simplified example of this is that when its temperature is less than 0C (32F), water will freeze transitioning it from a liquid state to a solid state.
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