Synchro Monsters
Synchro monsters are a new type of monster which are similar to ritual monsters, in order to summon, they require a tuner monster, and a monster who's combined levels equal that of the synchro monster being summoned, synchro monsters have white cards.
 Tuner Monsters
Tuner monsters are monsters used to synchro summon, they are usually of low level, though higher leveled Tuner monsters exist and higher leveled Synchro tuner monsters exist for example: Life Stream Dragon and T.G. Wonder Magician.