What is the cooking utensil that you place hot trays on it to cool it?

The cooking utensil you place hot trays on to cool it is called a trivet.

Trivets are usually made of materials like:

* Wood: Provides a natural, rustic look and protects surfaces from heat.

* Metal: Offers durability and can withstand high temperatures.

* Ceramic: Offers a decorative element and protects surfaces from heat.

* Silicone: Offers flexibility and heat resistance, and is often used in modern kitchens.

They come in various sizes and styles to suit different needs.