Molarity is a way to express the concentration of a solution. It is defined as the number of moles of a solute (the substance being dissolved) per liter of solution. The formula for calculating molarity is: Molarity (M) = moles of solute / liters of solution. This measurement helps chemists understand how concentrated a solution is, which is important for reactions and experiments. In practical terms, if you have a solution with a molarity of 1 M, it means there is 1 mole of solute in every liter of that solution. Molarity is commonly used in chemistry, biology, and various scientific fields to ensure accurate measurements and reactions.