Difference between oil and fat : 

1.  Oils are  Liquid at room temperature,  but fats are Solid at room temperature
2. Unsaturated fats like monounsaturated and polyunsaturated are oil types but saturated and trans are fat types.
3. Oils are mostly derived from plants but fats are mostly derived from animal.
4. Oils improves cholesterol levels but fat Increases cholesterol levels