mouse24 :
Some parts of the EU refer to controllers as gamepads?
And they are wrong. It's because of the lack of appropriate knowledge and experience.
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NERD MODE = ON**
Controller is a device that can have very specific features, form and designation (For example, "Steel Battalion" Controller, Guitar Freaks/Guitar Hero "Guitar Controller", Dance Dance Revolution/Pum It Up/InTheGroove "Dance Mat", BeatMania "DJ Stand", PlayStation "Move", "WiiMote", Nintendo "Power Glove", "Para-Para Paradise Motion Sensors", Nintendo "Power Pad", DrumMania "Drummer Set" and etc., all of those are Controllers, not Gamepads or Joypads).
"Controllers" are usually very specific devices designed for a specific set of games or one game title/series at all. For example, "Guitar Hero" Controller absolutely not suitable for playing any other games, it would make buggy inputs and etc., and "Para-Para Paradise" Controller can't be used for any other game WHATSOEVER, AT ALL.
"Gamepads" and "Joypads", on the other hand, are the typical input devices and both can be easily used with almost any video games, even "Controller"-specific titles like "Dance Dance Revolution" or "Guitar Freaks".
There is not much differences between "Joypad" and a "Gamepad", but there is some, so it should be taken into consideration, and those differences make them two separate kinds of input devices.
"Joypad" are basically the standard home video game console controller than you can (usually) only plug into the designated console.
While "Gamepad" is, mainly, a "Joypad for Personal Computer", which is plugged through USB/FireWire, or other kind of computer-specific way.
More than 95% of all "Gamepads" have monolith-type of a d-pad, while "Joypads" (by the most part) utilize the "4-way" classical d-pad design (which is more comfortable than monolith d-pad, IMHO). Also, "Gamepad's" buttons are almost always marked with numerical signs (for example, "1, 2, 3, 4" on the main action buttons) and most of them have either additional Turbo-switches/buttons by default, or have some other kind of tweaking, while "Joypads" are more classy (having either classical "A, B, X, Y", or less common "A, B, C, D").
Also, for most "Gamepads" driver installation is a must, because otherwise they can work incorrectly (make buggy inputs or turn-off suddenly).
And most obvious thing about "Gamepads": you can't use them on the majority of home video game consoles (even if home video game console has a USB port, it doesn't mean that your "Gamepad" would work if you plug it in there. Unlike "Joypads", which you can quite easily plug into your Personal Computer by using a special USB Adapter).
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NERD MODE = OFF**
There are many nuances and details about all this, It's a quite tl;dr thing, so I won't be continuing after this point. I just gave you a tiny little bit of info, it's a very small fraction of a very big picture.