What is the difference between P2P and P2M?

Could you please elaborate on the distinction between P2P and P2M in the realm of cryptocurrency and finance? I'm curious to understand how these two models differ in terms of their operation, purpose, and potential applications within the industry. Specifically, how do they compare in terms of transaction efficiency, security, and scalability? Additionally, are there any notable examples or use cases that highlight the unique strengths of each model?