https://i.ytimg.com/vi/9MSjYAGuG-0/hqdefault.jpg
In this Autodesk Maya rigging video I will explain the basic function of the IK Handle also known as Inverse Kinematics handle.
Link to part 1 Parenting : https://youtu.be/6nRl5XW7MBk
Link to part 2 : Joints : https://youtu.be/CF3rupjYWa4
source