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Types are a means to split monsters into groups (in a broader way to what Attributes do) in order to enable Support Cards granting various effects, to a specific order of monsters.
Each monster has 1 Type, and there are 23 different legal Types (the 22 listed are the ones allowed on this wiki) in the OCG & TCG, 1 exclusive to Yu-Gi-Oh! The Duelists of the Roses, and 4 made up.
Real Monster Types
Aqua
See the main article, Aqua.
Beast
See the main article, Beast.
Beast-Warrior
See the main article, Beast-Warrior.
Dinosaur
See the main article, Dinosaur.
Dragon
See the main article, Dragon.
Fairy
See the main article, Fairy.
Fiend
See the main article, Fiend.
Fish
See the main article, Fish.
Insect
See the main article, Insect.
Machine
See the main article, Machine.
Plant
See the main article, Plant.
Psychic
See the main article, Psychic.
Pyro
See the main article, Pyro.
Reptile
See the main article, Reptile.
Rock
See the main article, Rock.
Sea Serpent
See the main article, Sea Serpent.
Spellcaster
See the main article, Spellcaster.
Thunder
See the main article, Thunder.
Warrior
See the main article, Warrior.
Winged Beast
See the main article, Winged Beast.
Wyrm
See the main article, Wyrm.
Zombie
See the main article, Zombie.
Divine-Beast
See the main article, Divine-Beast.
Video Game-Only Monster Types:
Immortal
See the main article, Immortal.
Made-Up Monster Types:
Pixie
Pixie (妖精 Yōsei, Fairy), formerly named Nymph, monsters are a Type introduced by NovaTsukimori, representing actual fairy creatures that are more earthly in nature, like sprites and sylphs, as opposed to the angelic beings of the Fairy-Type. Outside of Archetypes, Pixie-Type monsters tend to play on the mischievous aspects of the fae, being a Type that usually focuses on stalling and sabotaging the enemy, as well as being able to continue their harassment by replacing themselves upon destruction ("floaters", so to speak). Individual Type support is discontinued after Fate of the Duelist, though the archetypes, "Chaos Beast" and "Celestial Nymph" still sees support. This Type is said to return by Boundary of the Duelist under the new name: "Pixie".
Elemental God
Elemental God monsters are a Type introduced by NovaTsukimori. This Type is only used on "Cosmic King Da'at". It alongside its Level 13 status, is used to signify that it is a card above all other cards in the game (save "Horakhty").
Darkness
Darkness is a Type that serves as a counterpart to the Creator God-Type. As of now, the currently only Darkness-Type monster in the Game is "The Darkness".
Cie
Cie is a Type introduced in Yu-Gi-Oh! Crystal-0 and it is used by Luna Yuhoshi.
Fishman
Main article: Fishman
Amorphous
Main article: Amorphous
Bound Warrior
Main article: Bound Warrior