No its not it was made up and then people spread the rumour that it was real.
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You have to get an account on the real minecraft website.
The real version of Minecraft comes from Minecraft.net, you can download the installation file from there, just double click on the exe once downloaded.
Endermen only exist in Minecraft. They are not real.
No.
You can set TNT off in Minecraft Beta by clicking it, or by triggering it with redstone.