What is XLM used for?

Could you kindly explain, in simple terms, what is the purpose and usage of XLM? I've heard about it in the context of cryptocurrency, but I'm still unclear as to how it actually functions and where it finds application in the financial or broader technological ecosystem. Is it primarily a means of exchange, a store of value, or does it serve some other specific purpose? I'm quite curious to know more about its utility and how it fits into the larger picture of digital currencies and blockchain technology.