A bond is an instrument of debt from the bond issuer to the bondholder.
A secured loan is a loan that is backed by an asset or equipment.
An unsecured loan is just the opposite of secured loan. In the case of an unsecured loan, the lender doesn’t need any collateral and at the same time, the borrower doesn’t need to offer any property/asset to avail the loan.
Secured loan is a loan protected by an asset/equipment. Whereas An unsecured loan isn’t protected by an asset.