This article is from the What Every Investor Should Know.
Corporate bonds generally are issued in denominations of $1,000. This is the face value of the bond, and is the amount the company agrees to repay to the bondholder when the bond matures. However, bonds may trade at a discount--an amount less than their face value--depending upon current market conditions, the movement of interest rates generally, and other factors. Some bonds are callable, which means that the issuer can elect to buy them back from holders--at the face amount--before the date of maturity. A bond may be in bearer form, which means that it may be sold by any individual who is in possession of the bond. Alternatively, a bond may be registered, in which case the name of the holder is recorded with the company or issuer of the bond. Some publicly held corporate bonds are rated by several private rating agencies. Those agencies use a combination of letters A through D to estimate the risk for prospective investors. For example, AAA (or Aaa) is the highest quality bond while C or D rated bonds are in default of payment. The ratings are not meant to measure the attractiveness of the bond as an investment, but rather how likely the principal will be paid if held to maturity.
 
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