What does "straight bourbon" signify?

"Straight bourbon" signifies that the bourbon is produced according to specific legal definitions that ensure authenticity and quality. The correct interpretation is that it is produced with no additives. This means that straight bourbon must avoid using any sugar or flavoring agents and must be made solely from traditional bourbon ingredients, which include a grain mixture that is at least 51% corn. This requirement underscores the spirit's purity and adherence to traditional bourbon-making methods.

In addition, straight bourbon must also adhere to specific aging criteria, requiring it to be aged in new charred oak barrels, but this question focuses more specifically on the absence of additives, making it a critical distinguishing characteristic of straight bourbon.