Secured and unsecured debt
Secured debt is backed by something the lender can take; unsecured debt is not.
A mortgage is secured on the house; car finance is often secured on the car. If you do not pay, the lender can take the thing.
Credit cards, overdrafts and most personal loans are unsecured. If you do not pay, the consequences are serious but they do not include losing your home.
That difference explains the rates. Secured lending is cheaper because the lender has a fallback.
It also explains why converting unsecured debt into secured debt deserves real caution. A consolidation loan against your home may lower the rate while raising the worst case from “bad” to “losing where you live”. That is a genuine trade, not a free improvement.
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