Machine

Machine monsters are powerful, and in some cases, fearsome to face in battle. They rely on high ATK as well as a variety of powerful effects, and they have some of the strongest Fusion Monsters in the OCG/TCG, made even stronger by the ATK-doubling power of "Power Bond", "Cybernetic Zone", and "Limiter Removal". Most Machine monsters have DARK, EARTH, or LIGHT attributes.In the Yu-Gi-Oh! (second series anime) first season, they have the special ability of immunity against all type of magic and Spellcaster attacks. Their general strategy varies, but they often have the ability to negate the effects of specific opposing cards or destroy them. Machine monsters also have two of their own Structure Decks, i.e. Structure Deck 10: Machine Re-Volt and Structure Deck: Machina Mayhem.

There are numerous Machine archetypes: "Ancient Gear", "Gadget", "Morphtronic", "Cyber Dragons", "Cyberdark", "Cyber Ogre", "Gradius", "Cycler", "Cyber Style", "Jinzos", "Gun Dragon", B.E.S.", "Vehicroid", "VWXYZ", "Machine Kings", "Ally of Justice", "Machina", "Reactor", "Karakuri", "Genex", and "Meklord" (which has the "Meklord Emperor", "Meklord Astro", and "Meklord Army" sub-archetypes).But a duelist that goes by the name of Jack has found that VW-tiger jet is useful as its effect is to discard one card to change the battle position of one of your opponents monsters.He has found it good for wooping Connor Powers butt!!

Trivia
Machines are one of the only Monster types that has been used by a semi major character in all the yugioh animes. They were used by Bandit Keith in the origional series Syrus Truesdale in Yugioh GX, and Leo in Yugioh 5D's more specifically the morphtronics.
 * Starting from Yu-Gi-Oh! 5D's many monsters that resemble machine type monsters but are in fact of different types started appearing, such as Yusei's Warrior Synchro monsters, the Scrap, Wind-Up, and Tech Genus. archetypes, etc.