* Gravity is a force of attraction between objects with mass. The more massive an object is, the stronger its gravitational pull.

* Every object with mass has gravity. Even you exert a gravitational pull on everything around you, though it's incredibly weak because your mass is small.

* The force of gravity increases with the mass of the objects. This means that the more massive an object is, the stronger its pull on other objects.

Here's a simple analogy:

Imagine a trampoline. If you place a small ball in the middle, it makes a tiny dip. Now, place a heavy bowling ball in the middle. The trampoline will sag much more dramatically. The bowling ball exerts a stronger pull on the trampoline because it has more mass.

Examples:

* The Earth has a strong gravitational pull because it has a lot of mass. This is why we stay grounded on the surface.

* The Sun has an even stronger gravitational pull because it's incredibly massive. This is why the planets orbit the Sun.

Key takeaway: The more matter an object has (its mass), the stronger its gravitational pull.