what's the difference between position and joint?

[caijun199702]

In real_env.py get_qpos() function, gripper_pos is left_qpos_raw[7], index is 7, while in sim_env.py, gripper_pos is left_qpos_raw[6], index is 6, while in sim_env.py, so I wonder what's the difference between position and joint? looking forward to your reply!