〜って
(casual) they said; (casual topic) what's …
Plain form + って · Noun + って
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って is the casual stand-in for the quoting と and for という, and you'll hear it constantly in conversation.
Quoting: 田中さん、明日は来ないって, "Tanaka says they're not coming tomorrow". The verb 言う is often dropped, so って alone means "they said" or "apparently".
Asking about a word or thing: 「積ん読」って何?, "what's tsundoku?" Here it stands in for というのは, marking what you're asking about.
It also passes on hearsay, like そうだ: 明日は雨だって, "apparently it'll rain tomorrow".
Keep it for speech and casual messages. In writing, use と, という and そうです.
Register: Casual: everyday speech with friends and family.
Examples
田中さん、明日は来ないって。
Tanaka says they're not coming tomorrow.
「積ん読」って何?
What's "tsundoku"?
明日は雨だって。
Apparently it's going to rain tomorrow.
先生が明日テストがあるって言ってたよ。
The teacher said there's a test tomorrow.
駅前のパン屋、すごくおいしいって。
People say the bakery by the station is really good.