Can you explain to them firstly how the debt based fiat monetary system operates? It is a lot easier to understand Bitcoin if you first understand how the fiat debt slavery monetary system we currently have imposed upon us operates- and the vast majority of people don't.
What if they think it is just magic internet money backed by nothing?
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If you understand and can explain how fiat money works then you should be able to explain what Bitcoin is and how it differs from fiat money. Your question suggests you understand neither and certainly cannot explain them both. Read The Bitcoin Standard to gain that understanding. https://z-epub.com/book/the-bitcoin-standard-epub-download
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