The three states of matter are solid, liquid and gaseous.
Solid State : The molecules are very close to each other hence intermodular spaces are small and intermodular force is strong. Hence solids have definite volume, rigid, retain definite shape and are incompressible
Liquids: The molecules are less closely packed have more intermolecular spaces than solid, less stronger forces than solids. Hence liquids have definite volume but no definite shape. They take the shape of container in which they are put.
Gases : The molecules in the gases are far apart with weakest force of attraction. Hence gases have neither definite volume nor definite shape but easily compressible.