A liquid.
There is no such state of matter. Solid has a definite shape and volume, liquid has a definite volume but not a definite shape, gases have neither a definite shape nor a definite volume.
A gas can change shape but it doesn't change volume, a liquid also changes shape but doesn't change volume.
Gas doesn't have a shape or volume of itself. Gas will take the internal shape and volume of whatever container you put it in.
The matter that can change shape and volume is gas.
solid
Solids
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Solid
solid
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A liquid.
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A solid has a volume and a shape a liquid has a volume but no certain shape a gas has no certain volume and no certain shape