What is the name of a substance that can dissolve in a liquid?

Solubility can be defined as an ability of a substance to get dissolved in a liquid. If a substance gets dissolved in a liquid, it is called a soluble substance. If it cannot dissolve in a liquid, then it is called an insoluble substance. When sugar or salt is added to water and stirred, they get dissolved. Therefore they are examples of soluble substances. When sand is added to water, it does not dissolve but settles down in the water. Therefore it is an insoluble substance. Solid is a substance made of closely-packed molecules.