Which of the following describes illegal agreements?

Illegal agreements are best described as contracts that are void and against the law. This means that these agreements cannot be enforced by any party because they involve actions or terms that are prohibited by law. Such contracts do not create any legal rights or obligations, making them unenforceable in a court of law.

The notion of illegality in agreements typically arises when the subject matter or terms violate statutory laws or public policy. As a result, any attempts to enforce such agreements or seek remedies for breaches would be futile, as the law does not support the execution or validation of illegal activities.

In contrast, other options reference concepts that do not entirely encapsulate the definition of illegal agreements. While agreements that require legal validation may refer to contracts that need to be proven before a court, this does not specifically pertain to their legality. Negotiations without a legal basis or verbal commitments without written proof focus more on the formation of contracts rather than their legality. Therefore, the definition that accurately captures the nature of illegal agreements is that they are void and against the law.