Are rear derailleur hangers universal?

In this video, we will uncover the following: - Explanation of the rear derailleur hanger's purpose and its role in bike performance. - Dive into the question, "Are rear derailleur hangers universal?," providing a straightforward answer. - Showcase of different types of derailleur hangers, demonstrating compatibility issues. - Tips on how to identify and choose the right hanger for your bike. - Discussion on the potential of universal hangers and their place in the market.