What is the difference between chalk and cheese?

It's often used to emphasize how two things are utterly dissimilar, like comparing apples and oranges.

Here's why the saying makes sense:

* Chalk is a white, powdery substance often used for writing on blackboards.

* Cheese is a dairy product made from milk, often yellow, orange, or white and comes in various textures and flavors.

These two substances are very different in their physical properties, appearance, taste, and uses. They are so distinct that they have nothing in common.

So, next time you want to emphasize that two things are completely different, you can say "they're like chalk and cheese!"