Sworn Statement
A sworn statement, also called a sworn declaration, is a document containing an oral or written statement that was given under oath or penalty of perjury.
It is similar to an affidavit, however, unlike an affidavit, a sworn statement does not have to be witnessed or notarized. The individual who gave the statement simply needs to sign a separate endorsement at the end of the statement, declaring that it is true and was made under oath or penalty of perjury.
Depending on the state and the particular court, a sworn statement may or may not be used in place of an affidavit.