Definition: Integrity is one-leg of a three-legged stool associated with information assurance that relates to the validity and reliability of all of information assets. The word itself (integrity) directly relates to the accuracy of the data records used for processing and decision making as well as the adherence to a process that guarantees the precision of the data. A weather report, for example, that predicts clear weather lacks "integrity" an ice storm hits the region in which you live.
Other components of information assurance include availability and confidentiality. The three concepts together contribute to maintaining a continuity of business operations. Mission critical operations are, otherwise, are at risk without information assurance.
Its Relevance: Information is gathered and processed mainly for one purpose - decision making. Accuracy is crucial. Unless the highest possible standard of information assurance can be routinely attained, the quality of the decision-making suffers. The more significant the failure of information assurance the less successful the organization or business will be.