What is the purpose of a small blanket placed on the edge of a hotel bed?

When you enter a hotel room, you will often see a small blanket carefully placed at the foot of the bed. Is it merely decorative or does it have a real function? Despite its understated appearance, this blanket plays a much bigger role than you might think.
This little blanket plays an unexpected role.

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A warm complement for the night:
Hotel rooms are usually air-conditioned, and some guests may find the temperature too cold. This lightweight blanket is an ideal additional solution for those who don't need a thick duvet, but want a little extra warmth.