"Ought to" is a phrase used to express a recommendation or obligation. It suggests that something is the right or appropriate action to take in a given situation. For example, if someone says, "You ought to study for the exam," they are advising that studying is a wise choice. In everyday conversation, "ought to" can also indicate a moral duty or expectation. For instance, saying, "You ought to help your neighbor" implies that helping is a good and responsible action. This phrase is often interchangeable with "should," but it can carry a slightly stronger sense of obligation.