承知VS承認VS賛成

I recently learned these words on Torii but I’m having trouble telling them apart! Jisho tells me that they all mean approval or consent in some way, but I’ve been looking around for the differences in usages without finding much more information besides that.

I did find this explanation but unfortunately it’s in Japanese. I understand now that 賛成 is used when one approves of another’s opinions, but I don’t really understand the explanation given for 承知. Can someone help me understand? ありがとうございます!

承知 https://kotobank.jp/word/%E6%89%BF%E7%9F%A5-532…
[名](スル)
1 事情などを知ること。また、知っていること。わかっていること。
「無理を承知でお願いする」
「君の言うことなど百も承知だ」
「事の経緯を承知しておきたい」
2 依頼・要求などを聞き入れること。承諾。
「申し出の件、確かに承知した」
3 相手の事情などを理解して許すこと。多く下に打消しの語を伴って用いる。「この次からは承知しないぞ」

賛成 https://kotobank.jp/word/%E8%B3%9B%E6%88%90-513…
① 物事がうまくいくように助力をすること。助成。賛助。
② 他人の説・意見などに同意すること。

承知 is used for “agreement” when responding affirmatively to a request or proposal.

承認 is like “acknowledgement.” I see it when I buy alcohol and have to push the “confirm your age” button at the counter.

賛成 is used to express that you have the same thought or view as another person.

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Thank you!

Aye. A group of people expressing agreement by shouting 賛成! is not uncommon in anime. :slightly_smiling_face:

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