Learn what "that's what best friends are for" means, when people say it, and how to use it naturally in English.

It means helping each other is normal and expected between close friends.
From Collateral Hearts, Episode 50
Someone reassures a friend by saying that is what close friends do.
Use this to comfort or support a friend who feels bad about asking for help. It is warm and very natural in casual speech.
Scenes unlock real expressions as you watch
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