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Validation refers to the process of verifying and confirming transactions or data within a decentralized network. Participants known as validators or nodes assess the accuracy and legitimacy of transactions before adding them to the blockchain or distributed ledger. Validation methods can vary based on consensus mechanisms, such as Proof of Work or Proof of Stake, and aim to ensure the reliability, security, and consensus-driven nature of the network, maintaining its integrity and trustworthiness.