Question

Which state of matter takes both the shape and volume of its container?

Answer 1

The State Of Matter Which Takes Both The Shape And Volume Of A Container Is Liquid

Answer 2

Gas is one of the four fundamental states of matter (with solid, liquid and plasma being the other states). It has the distinction of taking both the shape and the volume of the container that it is in.

If you want to include plasma, that too will expand - acting like a gas. So will supercritical fluids which might be considered gases by some definitions, but not by others..