Why does kinematics need an inverse solution? Isn't the positive solution enough?

The reason why inverse kinematics is needed is because inverse kinematics is an analytical method. By calculating the position and angle of the robot joint, the movement of the robot in a specific position and the required joint angle can be obtained. These calculations are based on calculus and some equations applied in robot kinematics and kinematics depth. Inverse kinematics can solve the unknown joint angle by calculating the joint angle required by the robot in a known position, so as to realize the movement of the robot in a certain position. It can also be used to help us analyze what kind of control strategy the robot should adopt in different motion environments in order to achieve maximum motion efficiency. Positive solutions are not enough.