Liquids and gases are a part of fluids.
Explanation
Liquids and gases are two states of matter and they differ from solids in terms of close packing of the particles and freedom of movement. The solid particles are closely packed allowing lesser freedom of movement while the particles are not the tightly packed in liquids and gases. gases have greater freedom of movement than solids and liquids and liquids have greater freedom of movement than solids.
Due to this factor liquids and gases can move or flow easily and that is why they are called fluids.
