According to Kinetic Theory of Matter :
Liquids have a definite volume, no definite shape & less rigidity.
i) Intermolecular space between particles of matter is slightly more than than the solids,
ii) Force of attraction between the particles is less than solids,
iii) Particles are free to move around in the liquid.
Due to all such factors liquids have a definite volume but no definite shape.