What is the difference between MIOTA and IOTA?

Could you elaborate on the key distinctions between MIOTA and IOTA? I've heard of both terms in the context of cryptocurrency and the Internet of Things, but I'm still a bit fuzzy on their precise roles and how they differ. Does MIOTA represent a specific unit of IOTA, or is it a separate currency altogether? What are the use cases for each, and how do they interact with each other? Clarifying these differences would help me better understand the ecosystem and its applications. Thank you for your assistance in clarifying this matter.