Is it a crime to borrow money and not pay it back?

I'm curious to know, is it considered a criminal offense if someone borrows money and fails to repay it? I've heard conflicting opinions on this matter and I'm seeking clarification. Could you please elaborate on the legal implications of defaulting on a loan, taking into account factors like the intention of the borrower, the terms of the agreement, and any potential consequences that may arise? I'm particularly interested in understanding how the legal system handles such cases and what remedies are available to creditors who have been left unpaid.