Define the term solubility.How does it change on increasing the temperature of water?

In chemistry, solubility is the ability of a substance ( solute) to form a solution with another substance (solvent). 
Like dissolves like. Which means polar compounds are soluble in polar solvents and non-polar compounds in non-polar solvents. 

Solubility of a solid increases with increase in temperature if the dissolution is endothermic (heat is absorbed) 
And solubility decrease with increase in temperature if dissolution is exothermic (heat is released). 

E.g Solubility of NaCl/KNO3 increase with increase in temperature.
Solubility of Na2SO4 decreases with increase in temperature

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