An "Amended Delaware Personal Income Tax Return" is a personal (individual) income tax return that has changed since it was originally filed with DE state.
"Amended Returns
If any changes made to your federal return affect your state income tax liability, you are required to report the change to the Delaware Division of Revenue within ninety (90) days after the
final determination of such a change and indicate your agreement
with the determination or the grounds of your disagreement. Use
Form 200-01-X to change an income tax return you have already filed,
and attach a copy of any federal adjustments."
Please review the following TurboTax FAQ that explains "amend":
https://ttlc.intuit.com/replies/4204352