How ZIP files are protected with password? (How to encrypt files?)

Are ZIP really encrypted based on a password?
Or is it just like a lock to the box?
So if we break the lock then we can open the box.
If they are encrypted based on password,
Which cryptographics algorithm is used? Like AES.
If not encrypted, how to encrypt files?

Maybe this can help:

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Change your topic to off-topic

Iā€™m sorry but you should know that off-topic is closed.