Proof Of Burn (PoB) unlike the other popularly used consensus in crypto mining and staking (PoW and PoS), it involves sending a coin/token to an unspendable address on the Blockchain to render it unspendable forever which is referred to as Coin Burn and the sender is then rewarded with another coin/token.
The addresses used are randomly generated without private keys which makes the wallets hodling the coin/token inaccessible for anyone to spend again.