Molarity, also known as molar concentration, is defined as the number of moles of a solute per liter of solution. It is a measure of the concentration of a chemical species in a solution and is commonly expressed in units of moles per liter (mol/L), denoted by the symbol M. A 1 M solution contains one mole of solute in one liter of solution. This measure references the total volume of the solution, including both solute and solvent, not just the solvent volume.