Matter exists in four different forms - solid, liquid, gas, and plasma. These are the four states of matter. You can recognize each state because they have different properties. A property of a material describes how it behaves. This behavior is not observable at the chemical level due to microscopic sized particles. We can observe how many H2O particles behave when we open a faucet, releasing water, which is a lot of H2O particles in their liquid state. Of course we can observe other states of H2O particle groupings, at low temperatures they freeze, demonstrating a solid property. At high temperatures they form a gas called steam.
Particles are still touching and held by very strong forces of attraction.
They are free to move past each other.
Because the particles can move, liquids don't have a definite shape, and they can flow.
Because the particles are still packed close together, liquids can't easily be compressed and keep the same volume.
Because there are lots of particles in a small volume, liquids have almost the same density as when they are solid. Some, like water are actually more dense than their solid, but most are very slightly less dense.