Here's a breakdown:

* Archimedes' Principle: This principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that the object displaces.

* Buoyant Force: This is the upward force exerted by a fluid on an object that is partially or fully submerged in it.

* Weight of Fluid Displaced: This is the force exerted by gravity on the volume of fluid that is moved out of the way by the submerged object.

In simpler terms: When you put something in water, it pushes some of the water out of the way. The amount of water it pushes out is equal to the weight of the object that's floating.

Examples:

* A boat floating: The boat displaces an amount of water equal to its own weight, allowing it to float.

* A balloon filled with helium: The balloon displaces air equal to its own weight, making it lighter than air and allowing it to rise.

Let me know if you'd like more examples or explanations!