Fluid
Fluid explained in an easy to understand way:
Imagine trying to fit all your clothes into a suitcase when packing for a trip. Just like how you maneuver and adjust each piece of clothing to fit the suitcase's shape, a fluid moves and conforms to the shape of whatever container it's in. In both cases, the key is adaptability: your clothes fill the available space in the suitcase, much like a fluid fills and takes the form of its container, adjusting its shape to fit perfectly.
Practice Version
Fluid: A material that can flow and take the shape of its container. Fluid. A fluid is any substance, like a liquid or gas, that can flow and easily change shape.