How can someone send money to another person without revealing all personal details?

The question is quite broad and the answer can vary depending on your country and whether you're making a local or international transfer. However, cryptocurrency would likely be your best option if your goal is to send money internationally from one person to another without revealing any of your personal information. It's the fastest and offers a degree of semi-anonymity—though not full anonymity.

To transfer money this way, you need only the recipient's wallet address. You can send funds using traditional cryptocurrencies like Bitcoin, Ethereum, or Solana or stablecoins such as USDC, USDT, or EURC.

Some countries may have payment systems where you're already registered, meaning you've provided some of your information. In those cases, you would need to give minimal, but not all, information when sending money.

However, if you want to avoid providing personal information entirely, a wallet-to-wallet crypto transfer is likely your best option. You would need to figure out how to get funds into your wallet first and then transfer them to the recipient. While this method isn't always the safest, it seems to align most closely with what you're asking for.