Proof of Work (PoW) is a consensus mechanism used to validate transactions and secure a blockchain. In a PoW system, participants called miners compete to solve complex mathematical problems. The first miner to solve the problem gets the right to add a new block to the blockchain and is rewarded with newly created coins and transaction fees.This process ensures that adding blocks requires significant computational power and energy. As a result, it makes it costly and time-consuming to attack or manipulate the network, thus enhancing security.However, PoW has its drawbacks. It consumes a large amount of energy, leading to concerns about environmental impact. Additionally, mining can lead to centralization, where a few entities dominate the network due to their access to resources.Despite these challenges, PoW has proven effective for creating secure and decentralized networks, with Bitcoin being the most notable example that uses this system.