Insulation refers to:
* The act of insulating something: This means to protect something from heat, cold, sound, or electricity by surrounding it with a material that resists the flow of those things.
* The material used to insulate something: This material is typically designed to be a poor conductor of heat, sound, or electricity.
Here are some examples of how "insulation" is used:
* "The house has good insulation, so it stays warm in winter."
* "Fiberglass is a common type of insulation used in walls and ceilings."
* "The electrician used electrical insulation to protect the wires."
Let me know if you were looking for something else, and I'll do my best to help!