Meaning of confirmation within n blocks? [duplicate]

Meaning of confirmation within n blocks? [duplicate]

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I have a hard time understanding the meaning of below sentence:

"To confirm within 48 blocks, a transaction fee of 1 satoshi/byte is required."

I have 2 questions here:

1) Does this mean that the first confirmation of the transaction will probably happen within attachment of the next 48 blocks?

2) As soon as the first confirmation is received, is it guaranteed that this confirmation will increment with all future block attachment (which is every 10 mins)?

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