They are shaped much like a small cliff, and are formed as the stream collides with the river bank.
It is the opposite of a point bar, which is an area of deposition of material eroded upstream in a cut bank.
Often, particularly during periods of high rainfall and higher-than average water levels, trees and poorly placed buildings can fall into the stream due to mass wasting events.
Given enough time, the combination of erosion along cut banks and deposition along point bars can lead to the formation of an oxbow lake.
Not only are cut banks steep and unstable, they are also the area of a stream where the water is flowing the fastest and often deeper.