As said at www.gdrc.org/icm/loan-glossary.html

"An amount owed for funds borrowed. The debt may be owed to an organization's own reserves, individuals, banks, or other institutions. The debt is normally secured by a note or bond or mortgage or other instrument that states repayment and interest provisions. The note, in turn, may be secured by a lien against property or other assets."

With respect to stock markets, a company may have debt in the form of secured/unsecured loans, bond issues.

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