Question

how is mass different from weight

Answer 1

mass is measured by fundamental quantity
weight is measured by derived quantity

mass is amount of matter contained in the body weight is gravitational acting on the body

mass si unit is kg ;weight 's unit is newton

mass is measured using beam balance
weight is measured by spring balance

Answer 2

Mass is a fundamental quantity.
It is nothing but the amount of substance or molecules or whatever you consider a person / object has.
It's unit is kg.

The force exerted by a mass is referred to as weight. It's unit is newton.

In other words the weight of a person / object In zero g is considered to be mass.