With Proof of Stake (POS), cryptocurrency holders validate block transactions based on the number of coins staked by the validator.
Proof-of-stake (POS) was created as an alternative to Proof-of-work (POW), the original consensus mechanism used to validate the blockchain and add new blocks.
While PoW mechanisms require miners to solve cryptographic puzzles, PoS mechanisms require validators to simply hold and stake tokens.
Proof-of-stake (POS) is considered less risky in terms of the possibility of attacking the network, since the compensation is structured in such a way that makes the attack less profitable.
The next block writer in the block chain is randomly selected, with higher odds assigned to nodes with higher stakes.