Here's why:

* Buoyant Force: This is the upward force exerted by a fluid (like water or air) on an object submerged in it. The buoyant force is equal to the weight of the fluid displaced by the object.

* Weight: This is the downward force of gravity acting on the object.

When the buoyant force and weight are equal:

* The upward force (buoyant force) perfectly balances the downward force (weight).

* The object will neither sink nor rise, remaining suspended at a constant level in the fluid. This is the definition of floating.