Like me I always known what Inverse Kinematics is specially when doing 3d Rigging, so whats the opposite of that.The forward kinematics of course.
Lets go with Inverse kinematics, its something to do with joints, for example our arms and legs, they bend in one direction, it could be on any other direction for say a robotic arm. But what makes it bend? When you do push ups, a force is being applied on your hand, making the joints in your arm bends in a certain direction. Its called affectors , a force that affects certain part of an object. The whole idea of is called Inverse Kinematics in simple terms.
Forward kinematics is easy, think of 90 degree angle lines, think of yourself holding a 1kilo barbel, we normally just lifts it with our forearm, down and up. Also our legs when you kick a soccer ball, when you lift your whole arm up in the air. These movements is termed forward kinematics the force is being applied from the joint. Robotics make use of these terms, and while character rigging in 3ds max you can find them as well.
So just a little snippet so my little self dont forget.