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I/O (input/output), pronounced "eye-oh," describes any operation, program or device that transfers data to or from a computer.

the link is in the comments (update to the update) Kongregate sent a letter to the devs of that game to shut it down for copyright reasons. So it no longer exists, But there is suroi.io. which is made by the same devs as the game that got shut down. so go play that one if you still miss surviv.io.