What's the difference between mass & weight & how they are measured

The difference between mass and weight is that Mass is that amount of matter in a material on the other hand weight is the measurement of how Force of gravity acts upon a mass.

Explanation:

There is a basic difference, because mass is the actual amount of material contained in a body and is measured in kg, gm, etc. Whereas weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything but weight is different on the earth,