Bots are computer programs that play the game for you. For example, someone could write a bot that will repeatedly run through the Riverside Province, farming everything he can along the way. They are harmful to the game because they skew the economy. There is no way a real player (who has to do things like sleep, work, exercise, and eat) can compete with a bot that can run 24/7 in terms of gathering cash. There are other ways in which bots can be harmful, but those should be self-evident.
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