Liquids are less dense than solids.
Density: It is defined as mass per unit volume of particles present in a matter.
Liquids have less inter-particle force of attraction than solids, so mass per unit volume will be less for liquids as compared to solids.
Concluding statement
Liquids have less inter-particle force of attraction than solids, so mass per unit volume will be less for liquids as compared to solids.Therefore, the statement is true that liquids have less density than solids.