Immutability refers to the characteristic of a blockchain that prevents any alteration of recorded data. Once a transaction is added to the blockchain, it cannot be changed or deleted. This feature is crucial for ensuring the reliability and trustworthiness of the system.Each block in the blockchain contains a unique hash of the previous block, along with its own data. If any information in a block is altered, its hash will also change, breaking the chain. This makes it nearly impossible to tamper with past transactions without being detected.Immutability enhances security and builds confidence among users. It acts as a deterrent against fraud and unauthorized modifications, since altering the data would require an enormous amount of computational power and consensus from the network participants.This property is one of the key reasons why many users and investors trust blockchain technology and the assets stored within it. The certainty that transactions are permanent provides a strong foundation for various applications, including finance, supply chain management, and digital identity verification.