Wadai (話題) refers to a 'topic' or 'subject' that people are talking about or discussing. It's often used when discussing what's currently popular or what someone brought up in conversation. For instance, '今日の話題は何ですか？' means 'What is today's topic?'.

みんなが話している「テーマ」や「内容」のことです。例：今日の話題は何ですか？