if i buy a macbook does it come with applecare?

If by Apple Care you mean Apple Care+, the extended warranty and coverage for accidental damage incidents then. no, that is a separate purchase.

If you mean Warranty, then it comes with the standard one year manufacturer's warranty that covers manufacturing defects, but will not cover user caused damage.

If you get it from a physical store, AppleCare+ is separate.

If you get it from the online Apple Store, you'll be given the option when configuring it.

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