Here's a breakdown:

* Buoyancy is an upward force exerted by a fluid (liquid or gas) that opposes the weight of an immersed object.

* This force is caused by the difference in pressure between the top and bottom of the object. The fluid pressure at the bottom of the object is greater than the pressure at the top, creating an upward force.

* If the buoyant force is greater than the object's weight, the object floats. If the buoyant force is less than the object's weight, the object sinks.

Let me know if you'd like to know more about buoyancy!