A tablespoon is a unit of capacity in the US customary systems of measurement.
A tablespoon is approximately equal to 15 milliliters or 3 teaspoons.
16 tablespoons are equal to 1 cup.
The kitchen utensil you see above is a measuring spoon that is equal to 1 tablespoon. This one can be used when cooking or baking.
The one at the bottom is an actual tablespoon or the spoon that is used to eat or serve food. The capacity of the tablespoon is of course 15 ml.
Tablespoon can be abbreviated with Tbsp, tbsp, T, TB, or tbsp.