There is gravity everywhere – only in some places it is really really weak, so it’s like there is no gravity.
If you’re near something with a lot of mass (say, the Earth or the Sun) then you’ll feel a lot of gravity (hence you don’t float off if you jump), but if you are somewhere smaller then you don’t feel the gravity the same (so Mars has 3 times less mass than Earth, so if you jump, there is 3 times less gravity so you could go a lot higher).
The moon orbits the Earth because of the Earth’s gravitational pull, and the Earth orbits the sun because of the sun’s gravitational pull. But all the stars in the milky way are also being pulled by the gravity from the centre of the galaxy – scientists think the centre mighte actually be a supermassive black hole!
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