A Finality Gadget is a mechanism used to determine when a transaction or block is considered final and irreversible on a blockchain. It enhances the consensus process by establishing a point where all participants agree that the block is part of the permanent ledger.Different blockchains have various finality models. In proof-of-work systems, finality is probabilistic, meaning the more confirmations a block receives, the less likely it is to be reversed. In contrast, a Finality Gadget provides deterministic finality, ensuring that once a transaction is committed, it cannot be changed or canceled.One well-known example is the Caspian Finality Gadget, which works alongside traditional consensus algorithms to provide immediate finality. This allows users and applications to operate without the uncertainty associated with probabilistic models, creating a more reliable environment for transactions.Overall, Finality Gadgets improve user confidence in blockchain systems by making it clear when data is stable and secure, leading to better usability and trust in decentralized applications.