Discrimination refers to overt and intentional unequal treatment, often based on prejudicial beliefs, while discrimination is enshrined in law, public policy, or common practice.

overtcovert

Explanation:

Overt discrimination is treating someone unequally based on prejudicial treatment. For example unequal treatment at work based on a person’s age, race, or gender. Overt discrimination is intentional and clear.  

Covert or subtle discrimination is harder to be identified because we know it is wring but we do it anyway, and it has become a common practice. For example making comment about a female driving.