An exchange offer, in finance, is a form of tender offer

Tender offer

Tender offer is a corporate finance term denoting a type of takeover bid. The tender offer is a public, open offer or invitation by a prospective acquirer to all stockholders of a publicly traded corporation to tender their stock for sale at a specified price during a specified time, subject to...

, in which securities are offered as consideration instead of cash.

In a bond exchange offer, bondholders may consensually exchange their existing bonds

Bond (finance)

In finance, a bond is a debt security, in which the authorized issuer owes the holders a debt and, depending on the terms of the bond, is obliged to pay interest to use and/or to repay the principal at a later date, termed maturity...

 for another class of debt

Debt

A debt is an obligation owed by one party to a second party, the creditor; usually this refers to assets granted by the creditor to the debtor, but the term can also be used metaphorically to cover moral obligations and other interactions not based on economic value.A debt is created when a...

 or equity

Stock

The capital stock of a business entity represents the original capital paid into or invested in the business by its founders. It serves as a security for the creditors of a business since it cannot be withdrawn to the detriment of the creditors...

securities. Companies will often seek to exchange their securities to extend maturities, reduce debt outstanding or convert debt into equity.