Which type of offer may not be accompanied by formal communication?

An implied offer is one that is not communicated verbally or in writing but is instead inferred from a person's actions or the circumstances of a situation. In such cases, a party's conduct indicates an intention to enter into a contract, even without formal communication. For example, when a person dips their hand into a pool, it implies an offer to pay for the use of the pool, assuming it is understood in a certain context.

In legal terms, an offer must demonstrate the intention to create a legal obligation, and an implied offer accomplishes this through behavior rather than explicit language. This distinction is important because while other types of offers, such as unilateral and conditional offers, typically require some level of clear communication—whether it's a specific promise contingent on certain conditions or a promise made in exchange for an act—an implied offer does not necessitate the same formal communication.

In contrast, a written offer clearly indicates the terms and conditions laid out in a document, and a conditional offer expressly outlines the conditions under which it would become valid. Therefore, an implied offer stands out as it derives from the context and actions rather than formalized communication.