It is easy to believe that cayenne pepper is a pepper but it is not true but it is a type of chili. Cayenne pepper is the small sharp fruits of a perennial low bush. Just like pepper, Spanish pepper, chili etc. belong to the capsicum genus. The strength of the chili fruits is measured in so-called scoville devices, indicating the amount of capsaicin, the chemical substance that is the strength. A mild chili variety can be between 100-500 Scoville, medium-strong varieties between 1000-5000 Scoville and really hot up to 570,000 Scoville. Cayenne pepper = about 27,000 scoville. Cayenne pepper raises the heat in sauces, soups, dressings, seafood and fish pots and in meat pots.