A blockchain is a public database meant to secure a network and provide incorruptible/immutable data. It's at the heart of every single cryptocurrency technology but the public nature of blockchains is a double edged sword .
Solbank protects your privacy by utilizing a kind of 'collective piggy bank' where users deposit equal amounts of SOL into a given piggy bank. When a user is ready to spend their money, they can withdraw any one of the equal deposits from other users. This way, the output transactions cannot be linked to any specific input transaction. By using smart contracts and zkSnark technology, we confidently ensure the links between transactions are effectively broken.
In other words, It's like a cash register. Money flows in and out of the register, but nobody knows who owned which bill previously.