An evening greeting meaning 'good evening'. Usually written in kana; the written particle は is pronounced 'wa'.
こんばんは、今日はいい夜ですね。
Good evening — it's a nice evening tonight.
友達と居酒屋で会って、入り口で『こんばんは』と挨拶した。
I met a friend at an izakaya and greeted them with 'good evening' at the entrance.
電話に出て『こんばんは、〇〇です』と言った。
I answered the phone and said, 'Good evening, this is 〇〇.'