A dilute solution has a low concentration of the solute compared to the solvent. The opposite of a dilute solution is a concentrated solution, which has high levels of solute in the mixture.
To achieve a dilute solution, more solvent is simply added without adding any more solute into the original mixture. The solution is then stirred to mix the two ingredients thoroughly. This ensures that all parts of the mixture have the same composition. The chemicals that can be diluted are gases, vapors and liquids. Solutions are diluted and can be monitored to attain a desired level of concentration.