Oil is a viscous liquid derived from petroleum, especially for use as a fuel or lubricant.
The term "oil" can refer to:
1. Crude oil - unrefined petroleum
2. Cooking oil - edible oils used in food preparation
3. Essential oils - concentrated hydrophobic liquids containing volatile aroma compounds from plants
4. Motor oil - lubricant used in internal combustion engines
5. Oil painting - a painting technique using oil-based paints