What writing format might be practiced in informal writing?

The option that highlights informal writing is personal emails because they often reflect a casual and conversational tone. In personal emails, the structure is usually less rigid, allowing for a more relaxed style, which can include informal greetings, slang, and a focus on personal experiences or thoughts. Unlike business reports, research essays, and academic papers, which adhere to formal writing conventions and specific formats, personal emails are designed for direct communication between individuals, making them more flexible in terms of expression and structure. This informality helps convey emotions and personal connections, distinguishing it clearly from the other writing formats.