What is the difference between beam and beam 2?

Excuse me, could you please elaborate on the differences between Beam and Beam 2? Are they simply iterations of the same cryptocurrency, or do they have fundamentally different characteristics, such as their use cases, consensus mechanisms, or scalability? Additionally, is there a specific reason behind the naming convention of Beam 2, and how does it differentiate itself from the original Beam? Understanding these nuances would greatly help me in my research on the cryptocurrency space.