What type of matter is defined as having a definite shape and volume?

The type of matter that is characterized by having a definite shape and volume is solid. In solids, the particles are closely packed together in a fixed arrangement, which allows them to maintain a specific shape and volume regardless of the container they are placed in. This contrasts with liquids, which have a definite volume but take the shape of their container, and gases, which have neither a definite shape nor volume and expand to fill any available space. Semi-solids can exhibit properties of both solids and liquids, but they do not possess the strict characteristics that define a solid, particularly in terms of having a consistent shape. Thus, solids are uniquely identified by their rigidity and stability in both shape and volume.