what is aikido ninpo

I went to a sport center, and there I saw that they teach aikido ninpo there.
could someone tell me what that is, and what the deferens between other aikido forms
(explain the deferens with the Aikikai style)

Aikido and ninpo (ninjutsu) are two different arts.

Authentic ninjutsu is comparatively hard to find, as the only legitimate schools trace their lineage back to Dr. Masaaki Hatsumi, Togakure-ryu.

If they are trying to tell you that is one art, find a new place to train. McDojo!!

I didn't think of joining, I just wandert what is was