Mass is not easy to understand.

1  Introduction                                              Gravity Home Page

1. Gravity is the force by which a planet or other body draws objects toward its centre. The force of gravity keeps all of the planets in orbit around the sun.
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3. Mass is a     measure     of how much matter is in an object, while weight is a measure of  the pull of gravity on you, your weight.  You'll be lighter on the moon. 
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5. Mass is the amount of matter in an object. Mass is measured in kilograms (kg). Weight is a force due to the pull of gravity on an object. 

Mass and weight are not equal in science: 

2  More on Mass

1. The amount of matter in an object, measured in kilograms (kg) or grams (g). 
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3. It doesn't matter where it is, mass remains the same.

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3  Weight

1. Weight changes depending on the strength of the gravitational field acting on the object. 
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3. For example, you weigh less on the moon than on Earth because the moon's mass is different from Earth's. 
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5. In everyday life, mass and weight are often used one for the other, but in physics they have different meanings. 

Based on this source.

4  Gravity force

1. Gravity force is the force that causes things to go faster or accelerate.  
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3. When you place a marble on a downward slope you'll see the marble begin to accelerate as it makes its way down to the bottom. 
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5. That's gravity at work.
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7. Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.

Based on this source.

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