What is the difference between VoIP and cloud calling?

Can you clarify the distinction between VoIP and cloud calling for me? I'm trying to understand how they differ and which one might be more suitable for my business needs. Specifically, I'm curious about the technical aspects, like how they route calls and the infrastructure they rely on. Additionally, I'd like to know if there are any cost or scalability advantages to choosing one over the other. Thank you for your help in explaining this to me.