What Is the Difference between Probabilistic Finality and Absolute Finality?

Probabilistic finality, common in Proof-of-Work, means the chance of a transaction being reversed decreases exponentially with each new block added. It is never zero, but becomes negligible after many confirmations.

Absolute finality, common in some Proof-of-Stake or hybrid systems, means that once a transaction is finalized (e.g. signed by a supermajority of validators), it is mathematically guaranteed to be irreversible. Absolute finality offers a stronger, immediate guarantee of immutability.