Folding is when when one or a stack of originally flat surfaces, such as sedimentary strata, are bent or curved as a result of deformation. In other words, when the Earth curves and bends a certain way to make a piece of land deform. Below is a result of folding:
A fault that runs along the boundary between two tectonic plates is called a transform fault. Faulting in general is when large faults within the Earth's crust are the result of motion and active fault zones are the causal locations of most earthquakes. Explaining why earthquakes have the intense shaking motion that they do. Above is a picture of the result of faulting along a boundary of land.