Preferred stock  is also referred to as preferred shares  or preference shares. This refers to shares that are of a higher quality or “higher ranking” than common stock . The terms of purchasing this type of stock is negotiated between the investor and the corporation .
One of the characteristics of preferred stock is that it does not come with any voting rights. But, it usually has priority over common stock when it comes to receiving payment of dividends when stock has been liquidated. Preferred stock also may carry a convertibility feature which would allow transfer over to common stock when the investor deemed fit. Stockholders that have preferred stock will receive payment of assets  before common stockholders but after debt  holders in the unfortunate event of a bankruptcy . When preferred stockholders receive their stock, the terms of their agreement are stated in the “Certificate of Designation”.
There are different types of preferred stock. There is Prior Preferred Stock which is stock that usually has a lower yield  than other preferred stock. If a company only has enough money to pay out dividends on one of the preferred issues then the Prior Preferred Stock will be paid. There is, of course, the disadvantage of the lower yield.
Then there is Preference Preferred Stock. This is stock that is rank behind the company’s prior preferred stock. These issues receive payment preference over all the other classes of stock except prior preferred.
Convertible Preferred Stock refers to stock that the stockholders can exchange for a certain amount of common stock.