* Paint thinner: Paint thinner is used to dissolve paint, varnish, and other coatings. It's a solvent, meaning it breaks down the chemical bonds holding the paint together.

* Nail polish thinner: Nail polish thinner is designed to dissolve nail polish. It's specifically formulated for this purpose.

* Other thinners: There are various other types of thinners, like acetone, methyl ethyl ketone (MEK), toluene, and xylene, each designed to dissolve specific substances.

Therefore, to answer your question accurately, you need to specify what type of thinner you're referring to.