What happens to a user profile when a blank value is imported via CSV?

When a blank value is imported via CSV, it retains existing values in the user profile. This means that if a specific field in the CSV file is blank, the system will not alter the existing data for that field in the user profile. Instead, the original value will remain intact. This functionality is particularly useful for maintaining user information without accidentally erasing existing data during updates or imports.

In contrast, other options suggest potentially destructive behaviors, such as overwriting, creating duplicates, or removing all previous data, which would not be the case with a blank import in this context. Thus, retaining existing values ensures that critical user data is preserved and maintained accurately.