Konbanwa means "Good evening." You use this greeting when you meet someone in the evening, typically from dusk onwards. Like "Konnichiwa," it's a common and polite way to greet people. For example, when meeting a friend for dinner, you'd say, "こんばんは！お元気ですか？" (Good evening! How are you?).

夕方(ゆうがた)から夜(よる)にかけて人(ひと)に会(あ)った時(とき)に使う(つかう)挨拶(あいさつ)です。丁寧(ていねい)な言い方(いいかた)です。「こんばんは！」