If you like someone's post or content then as a reward you can zap them and however amount of sats you choose will be sent to that person's wallet from your wallet.

It is just like when people superchat their favourite content creator on YouTube or Twitch, or subscribe to their channel by paying subscription fee.

But since those platforms are centralized, the platforms take 30-50 percent of the that money as commission but in case of nostr, it's all decentralized and uses bitcoin lightning network therefore the content creator receives 100% of the money instantly in their wallet in form of sats.

I hope you understood the how the zaps work. ⚡