In Fauna, null (or NULL) represents a lack of data value, not just a value of zero, and is used to indicate missing information in the database. Unlike SQL, where null is used as a state rather than a value, Fauna treats null as a direct value that can be compared. This allows for simpler comparison operations and reduces errors caused by special handling of nulls. Additionally, Fauna's handling of null values during sorting and indexing is more intuitive, with null values appearing at the beginning or end of sorted results sets depending on the ordering requested. Overall, Fauna's use of NULL aims to provide a more programmer-friendly experience, reducing errors and making it easier to work with missing data values.