How Does ‘Staking’ in PoS Secure the Network against a 51% Attack?

In a Proof-of-Stake system, a 51% attack would require an attacker to control 51% of the total staked cryptocurrency. Acquiring this much capital is prohibitively expensive and difficult to coordinate.

Furthermore, if an attacker successfully corrupted the network, the value of their own large stake would plummet, providing a massive financial disincentive. The protocol also includes 'slashing' to penalize malicious behavior.