It's not that something *gives* an object inertia. Inertia is an inherent property of matter. It's a fundamental characteristic of all objects, regardless of their composition or location.

Here's a breakdown of what inertia is and why it exists:

* Inertia is the tendency of an object to resist changes in its motion. This means an object at rest wants to stay at rest, and an object in motion wants to stay in motion at a constant speed and direction.

* Mass is the measure of inertia. The more massive an object is, the harder it is to change its motion.

* Inertia arises from the interaction of particles at the atomic and subatomic level. While we can't fully explain it, we know that the strong and weak forces holding these particles together contribute to the overall inertia of the object.

Think of it this way: Imagine you have a bowling ball and a feather. It's much easier to change the motion of the feather than the bowling ball. This difference in how easily their motion is changed is due to their different masses, which directly relates to their inertia.

So, inertia is a fundamental property of all matter, and it's directly related to the mass of an object.