Purpose of I-shaped inductor

How to detect the quality of inductance hollow coil

I believe many people are confused about the comparison of shielded inductor and unshielded inductor. According to the difference of magnetic shielding performance, there are two different names of shielded inductor and unshielded inductor. Shielded inductor includes chip inductor and I-shaped inductor, and the same is true for unshielded inductor.