In cooking, and a variety of other contexts, a volume unit that is not based on scientific research but that is widely used is referred to as a tablespoon. It is the name of a measuring utensil that is used in the culinary arts. One tablespoon is equal to one-sixteenth of a cup. However, in many parts of the world, a large spoon that is used for eating is referred to as a tablespoon even though the exact definition of a tablespoon is a serving spoon.
The milliliter is the unit of measurement that is represented by the letters "mL" in standard American use. The word "one thousandth" is what the prefix "milli-" really refers to. The metric system, which is the prevalent method of measuring across the majority of the world, provides us with the milliliter as a unit of measurement. There is no difference between one milliliter and another milliliter. https://mycalcu.com/
14.7868 milliliters is the exact volume that one tablespoon contains (ml in SI). Which is often rounded up to 15 ml most of the time.