AFK, it just about any computer game, means 'away from keyboard'.
It often just means 'I won't be able to respond or play till I get back.'
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You have been AFK for too long.
It's usually just a short cut from having to type or say: Away From Keyboard.Getting a drink, going to the bathroom, making lunch are some of the reasons.
'Vanilla' Minecraft means the original version of the game with no fan-made modifications.
Free minecraft sucks and paid minecraft rules. Question solved.
No, currently in vanilla Minecraft dinosaurs are not in the game. This means there are no spawn eggs for them.