Unity 3D Web Player is an application which you need to install when running online 3D application or games. Some 3D related websites, have this application installed automatically at your first visit at their websites, but some requires you to download and install it manually by redirecting you to their official website. One of the online website that requires you to have this Unity 3D Web Player installed before running their online application is Miivies.com (an online based 3D animation maker website).
Here's a video on how to install Unity 3D Web Player.
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