A casual relationship on dating sites typically refers to a non-committed, non-exclusive arrangement between individuals who are looking for companionship, physical intimacy, or fun without the expectation of a long-term commitment. It often involves a more relaxed approach to dating, with both parties understanding and agreeing to the casual nature of the connection. It's important to have open and honest communication to ensure that both partners are on the same page regarding their expectations and boundaries in the relationship.