Identify the type of joint present in knees and ankles from the given options.

Joints are the points at which two or more bones connect and allow movement.

A hinge joint is the type of joint found in the knees and ankles. Hinge joints enable back-and-forth motion in a single plane, similar to opening and closing a door. 

They are distinguished by rounded surfaces on the bones that fit into a trough-like structure and are held together by strong ligaments that aid in joint stabilisation and prevent excessive movement. 

Hinge joints can be found in the elbows, knees, and ankles and play an important role in allowing these joints to bend, straighten, and twist.