"The increase of disorder or entropy with time is one example of what is called an arrow of time, something that distinguishes the past from the future giving a direction to time, there are ar least three different arrows of time. First, there is the thermodynamic arrow of time, the direction of time in which disorder or entropy increases,then, there is the psychological arrow of time. This is the direction in which we feel time passes, the direction in which we remember the past but not the future. Finally, there is the cosmological arrow of time,this is the direction of time in which the universe is expanding rather than contracting."
Reference
A Brief History of Time,Chapter9 The Arrow of Time,page185
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