What does boundary error signify in a program?

Boundary error signifies that the data has crossed acceptable limits, which typically refers to situations where inputs exceed or fall below predefined thresholds. This can occur, for example, when a user inputs a value that is higher than the maximum allowed value or lower than the minimum expected value for a given variable. These limits are often set to maintain the integrity and stability of the program, ensuring that data processing remains within defined operational parameters.

When such errors occur, they can lead to unexpected behavior, crashes, or incorrect processing of data, highlighting the importance of proper validation checks in programming. This context underscores why boundary errors are critical to identify and manage within applications.