Certificates are an alternative to buying bonds and stocks, the investor can select from a wide offer according to the underlying asset and risk profile.

Certificates are debentures when the issuer of the certificate pledges to make payment to the investor for the borrowed funds in the pre-determined amount but its current price is based on the development of the prompt price of its underlying asset. 
 
They tend to be tied to the development of individual stocks, stock baskets, stock indexes, currency exchange rates and commodities, and can bring an additional yield during the time of a rising, stagnating and falling market.