Somebody said they are different because of gravity.
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Mass is “how much matter” (how many atoms, to fudge the facts a little) something is made of. Gravity is “how hard is gravity pulling on you”.
Your mass only changes if you diet, work out, cut pieces off yourself, or something like that, but your weight is one number on Earth, a lower number on the Moon or Mars, a higher number on Jupiter, and zero in deep space.
As long as you spend your whole life on the surface of Earth, there isn’t really a practical difference between the two. It becomes important to distinguish between them if you’re talking about objects that are at least partway out of Earth’s gravity field.
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