Data immutability refers to the concept that once data is created, it cannot be changed or modified. This characteristic is crucial in various fields, especially in programming and databases, as it ensures that the original data remains intact and reliable. When data is immutable, any changes result in the creation of new data rather than altering the existing one, which helps prevent errors and inconsistencies. In the context of technologies like blockchain, data immutability enhances security and trust. Since each transaction or record is permanently stored and cannot be altered, it provides a transparent and verifiable history. This feature is essential for applications in finance, supply chain management, and digital identity verification.