The interrogative mood is a way of using language to ask questions. When someone speaks or writes in the interrogative mood, they are usually trying to find out information or get someone to think about something.
The tone often achieved through an interrogative mood can be curious or probing. This means that the speaker or writer sounds interested and wants to learn more. It can also make people feel engaged and think deeper about their answers. For example, asking "What do you think about this idea?" shows that you care about the other person's opinion and want to hear their thoughts.