1The topic or subject taken up in a conversation, piece of writing, or news report.
今日の会議の話題は新製品の発売計画だ。
Today's meeting topic is the launch plan for the new product.
そのニュースはテレビで大きな話題になった。
That news became a major topic on TV.
友達と共通の趣味の話題で盛り上がった。
My friend and I had a lively conversation about our shared hobby.
会話の話題に困ったら、天気の話をするといい。
If you're stuck for a conversation topic, talking about the weather works well.
2Being much talked about and attracting attention; often used as '話題の〜' ('the much-talked-about ...').
話題のレストランは予約が取りにくい。
It's hard to get a reservation at the much-talked-about restaurant.
その新商品はSNSで話題になり、すぐに売り切れた。
That new product became a hot topic on social media and sold out quickly.
彼は今、話題の映画に出演している俳優だ。
He's currently an actor appearing in a much-talked-about movie.