At that age, the best answer is to get the 4 year old some wax to play with. You can buy dental wax at a drug store for around $3. It breaks off in little beads that they can roll in their fingers and get a feel for what wax is.
Play is actually a very effective method of learning. Think of it as a series of chaotic experiements. What happens if I squish it? How does it taste? Does it stick to the table? What happens if I roll it?
All of those things will teach you something about the physical properties of wax, all of which add up together to answer “what is wax”?
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