What are the dragonspawn of World of Warcraft

Dragonspawn have been created as part of an experiment by Deathwing and Nefarian, where draconian Humanoids were created as soldiers and commanders for the black dragon armies. Some say they were made from Humanoid worshipers who lived with the Dragons for so long, that they took on their shapes.

Each of the Dragonflights has Dragonspawn and Draconids of their respective color, while the Black Dragonflight also makes use of the artifically created Chromatic Dragonspawn, which show traits of all flights.