'对话' literally combines '对' (meaning 'facing', 'mutual', or 'to match') and '话' (meaning 'speech' or 'words'), together forming the concept of an exchange of words between two or more people — a conversation. It emphasizes reciprocity and interaction, distinguishing it from monologue or narration.

This noun is commonly used in both spoken and written Chinese to refer to any structured or informal verbal exchange: classroom dialogues, business meetings, language practice, or even scripted conversations in books and films. It’s neutral in register — appropriate for everyday use as well as formal contexts — and often appears in compound terms like '对话练习' (conversation practice) or '双语对话' (bilingual dialogue). While '说话' refers more generally to the act of speaking, '对话' specifically implies back-and-forth communication with at least one other participant.