The Earth's rotation is gradually slowing down. The primary cause of this deceleration is the tidal interaction between the Earth and the Moon. As the Moon orbits the Earth, it exerts a gravitational pull on the Earth's oceans, causing them to bulge out slightly on the side of the Earth facing the Moon and on the opposite side of the Earth. This tidal bulge creates friction against the Earth's crust, which causes the Earth's rotation to slow down.

The Earth's rotation is also affected by the Earth's internal structure. The Earth's mantle, which is the layer of the Earth beneath the crust, is constantly moving and shifting. This movement can cause the Earth's axis of rotation to wobble, which can also lead to a slight change in the Earth's rotation speed.

The Earth's rotation is also influenced by the gravitational pull of other planets in the Solar System. However, the effect of these planets on the Earth's rotation is much smaller than the effect of the Moon.

The Earth's rotation is expected to continue to slow down over time. However, the rate of deceleration is very small, and it will take many millions of years for the Earth's rotation to change significantly.