Объясните понятие согласованности данных в системах хранения информации.

Data consistency in information storage systems means that all copies of data or all related data are in a state that does not contradict the specified rules and constraints. This means that after an operation, the data remains correct and non-contradictory.

For example, if a database has a rule that the sum of money in accounts cannot be negative, then this rule must be followed after a transaction. In distributed systems, consistency guarantees that all nodes see the same data or changes in a certain order, which is important for the correct operation of applications.