Here's why:

* Earth's Rotation: The Earth rotates on its axis, causing objects moving over its surface to appear to curve.

* Inertia: Objects in motion tend to stay in motion in a straight line. However, because of the Earth's rotation, the straight line path of an object appears to curve from the perspective of someone on Earth.

* Direction: The Coriolis effect deflects objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

The Coriolis effect is important for understanding:

* Wind patterns: It influences the direction of large-scale wind systems like trade winds and jet streams.

* Ocean currents: It plays a role in the circulation of ocean water.

* Weather systems: It affects the development and movement of storms.