TL;DR

Too long, didn't read? Here's how Lethe works in a way that even a 5 year old could understand.

You can deposit money into a private pool, where only you can see your balance and withdraw from it at any time.

From this pool, you can send money to anyone without it looking like it came directly from you.

The recipient can then withdraw their funds from the pool whenever they choose.

Since all withdrawals come from the same pool, no one can easily trace who originally sent the money.

And all of this is done verifiably on-chain using Zero-Knowledge (ZK) technology.