Which state of matter is characterized by having no definite shape or volume?

The state of matter characterized by having no definite shape or volume is gas. In a gaseous state, the particles are not closely packed together; instead, they are spread out and move freely. This allows gases to expand to fill the shape of their container and occupy whatever volume is available. Unlike solids, which maintain a fixed shape and volume due to tightly packed particles, and liquids, which have a definite volume but take the shape of their container, gases can occupy a varying amount of space depending on external conditions such as pressure and temperature. This unique property of gases makes them distinct from the other states of matter. Plasma also does not have a defined shape or volume, but it is fundamentally different due to its charged particles and ionization, typically occurring under high energy conditions.