What is REF used?

Could you please clarify what you mean by "REF"? In the context of cryptocurrency and finance, there are various abbreviations and acronyms that could potentially stand for "REF". Without more context, it's difficult to provide a precise answer to your question. However, if we assume that "REF" is a reference to some form of token, coin, or other digital asset within the cryptocurrency space, then the answer to "What is REF used for?" would depend on the specific use case and functionality of that particular asset. In general, cryptocurrencies and digital assets are often used for a variety of purposes, including as a medium of exchange, a store of value, a speculative investment, or to facilitate certain types of transactions or interactions. If "REF" is a specific token or coin, its intended use would be determined by the developers and creators of that asset, as well as the community of users and investors who have adopted and are using it. Without knowing more about "REF" and its specific use case, it's difficult to provide a more detailed answer to your question. I hope this helps, and please feel free to provide any additional context or clarification that may be helpful in answering your question more precisely.