What is the difference between soluble solids and insoluble solids?

Soluble solids are those solids ( solute ) that when mixed with the right liquid (solvent), form a solution. Hence, the soluble solids dissolve in the liquid (water, oil, kerosene,etc.).

Eg: salt and water, sugar and water.

Insoluble solids are those solids that do not dissolve in water. On adding these insoluble solids to the water they either float or sink but do not mix with it.

Eg: stone and water, sand and water.

The main difference between soluble solids and insoluble solids is that soluble solids can be dissolved in liquids but Insoluble solids cannot dissolve in liquids.