Which state of matter is characterized by having an indefinite shape and a definite volume?

The state of matter characterized by having an indefinite shape and a definite volume is the liquid state. In this state, the particles are closely packed but not in a fixed position, allowing liquids to take the shape of their container while maintaining a consistent volume. This property distinguishes liquids from solids, which have both a definite shape and volume due to tightly bound particles, and gases, which have neither a definite shape nor a definite volume as their particles are far apart and move freely. Plasma, while also a distinct state of matter, consists of ions and free electrons and does not have a definite volume or shape, similar to gases. Understanding these characteristics is fundamental in differentiating between the various states of matter.