User blog comment:TinyCastleGuy/A Very Clever Conversation/@comment-5447234-20130826005735/@comment-1455034-20130826130732

You're right in saying that Herobrine isn't real. Although I've never played Minecraft, you simply have to look through the game's code and find if there is any programming for Herobrine.

Possibly there is, where it just uses already existing sprites. However, unless there is any programming for it, it definitely doesn't exist. Possibly "Herobrine" may be the name given to a whole bunch of glitches.