Increased security is a significant advantage of Proof of Stake (PoS) over traditional Proof of Work (PoW) consensus algorithms. Here's why:

1. _Majority stake required_: In PoS, an attacker would need to hold a majority (51% or more) of the total stake to launch a 51% attack.

2. _Financially impractical_: Acquiring such a large amount of stake is financially impractical and unlikely.

3. _Stake dilution_: Even if an attacker manages to acquire a large amount of stake, the stake would be diluted over time due to the natural flow of transactions and token movements.

4. _Community-driven security_: PoS incentivizes validators to act honestly, as they have a financial stake in the network's security and stability.

5. _Less centralization risk_: PoS reduces the risk of centralization, as validators are chosen based on their stake, rather than their computational power.

In contrast, PoW is more vulnerable to 51% attacks, as:

1. _Less financial barrier_: Launching a 51% attack on a PoW network requires significant computational power, but the financial barrier is relatively lower.

2. _Centralization risk_: PoW networks can become centralized, making it easier for an attacker to launch a 51% attack.

3. _Less community-driven security_: PoW incentivizes miners to prioritize their own interests over the network's security and stability.

By requiring a majority stake and incentivizing validators to act honestly, PoS provides a more secure and resilient consensus algorithm.