null value

A null value represents the absence of any data or information in a specific field or variable. It indicates that no value has been provided, recorded, or exists for that particular point. Unlike a zero or an empty string, which are actual data, null means “unknown” or “not available.” It helps databases and systems distinguish between missing information and intentional data inputs, ensuring accurate data management and analysis. Nulls are essential for handling incomplete data gracefully while maintaining the integrity of the dataset.