In the UK, a debenture is a name given to a security agreement that sets out the terms under which the borrower provides security to a lender. It is usually given in respect of a company rather than an individual.
A lender may require security from a borrower to confirm the obligation of the borrower to repay the lender the amount that is owed in the loan agreement.
Debentures may be used by the lender to take security over some or all the borrower’s assets.