Weight is a measure of the downward force gravity exerts on an object.
An object's weight depends on the strength of gravity at the location of an object. Weightlessness is the absence of the sensation of weight. Weightlessness can be achieved in one of two ways. Orbit a planet so that both you and the spacecraft are falling together at the same rate. If you are falling freely you feel no weight even though you technically do have a weight since you are experiencing the pull of gravity.