What is the significance of the covariant derivative of a tensor in differential geometry and how does it relate to the concept of parallel transport?

The covariant derivative of a tensor in differential geometry is important because it measures how the tensor changes as it moves along a curved space. It is crucial for understanding how quantities like vectors or tensors behave under parallel transport, which is the process of moving them along a curved path without changing their intrinsic properties. The covariant derivative helps us quantify how these quantities change as they are transported along a curved space, providing a way to define and study concepts like curvature and geodesics.