共通 (kyoutsuu) refers to something being common or shared among several people or things. It describes features, interests, or characteristics that are not unique to one but belong to many. It's often used when finding similarities. For example, '彼らには共通の趣味がある。' (They have common hobbies.)

共通 (きょうつう) はいくつかの物事に同じものがあること。趣味や意見など、一緒に持っている特徴です。例：共通の目標を持つ。