Next time why not just try explaining a zap as a method to "tip" someone

It's a second layer to Bitcoin that's a mutifunctional decentralized financial protocol.

Part of the lightning network, which is a system for micropayment channels, in order to scale the blockchain's capability and handle transactions instantaneously, more efficiently, and less costly.

Or you can say it's like cashapp with less fees.

But you need a self custody wallet.