I feel like people maybe give explanations that are too complex?
What I think people should know:
- it's a virtual currency that's completely unregulated - it is highly fluctuating in value because people do speculation on it (like the real world stock market) - the transactions are anonymized (sorta, there's no named associated to them but that's it) - the combination of all the computers that generate them consume energy in gargantuan proportions and that's the main problem about it
Most other cryptocurrencies are like that too. I don't think it's needed to get into what blockchain and mining is to people