Red Dot, Reflex, Holographic vs Prismatic

[Canadian2018]

I've been reading online about different types of sights (red dot, reflex, holographic, prismatic) and some articles say they are all the same and some articles say they are distinctively different.
Are they different? Are some American terms and others British terms?

 

[Daver_II]

Technically they are different. Practically not so much.

 

[josquin]

This article might be useful. This one, too. (Now where does the SeeAll sight fit in?)