The central bank interest rate sets the amount of interest that people who owe the central bank money pay the central bank. So this money goes from central bank borrowers (usually commercial banks) to the central bank. In some countries the central bank is part of the government but in most countries it is an independent entity.
Commercial banks however will mostly then copy the central bank interest rate. So that means money will go from their borrowers (mostly people with mortgages) to those private commercial banks.
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