Supercooled liquids are in a condition of metastable equilibrium where crystallization of solids from a liquid mixture takes place.
They are also called pseudo-solids that resembles liquid in many aspects. They flow very slowly at room temperature.
For example, glass is sometimes considered a supercooled liquid because rather than forming a crystalline structure, it forms an amorphous structure that allows materials to move in a molecule.
Supercooling is a property that allows an aqueous solution to attain a temperature below the freezing point without ice formation.