Here's a breakdown:

* Liquids commonly measured in liters: Water, juice, milk, soda, cooking oil, gasoline, etc. These are typically sold and used in quantities where liters are a convenient unit.

* Liquids measured in smaller units: Some liquids, like medicine or small amounts of ingredients in recipes, might be measured in milliliters (mL) or even smaller units.

* Liquids measured in other units: In some countries or industries, other units like gallons, pints, ounces, etc., are used to measure liquids.

Essentially, liters are a versatile unit for liquids, but it's not the only one used. The choice of unit depends on the specific liquid and the context of its use.