Once deemed as a benevolent agent to gather information for search engines, the lowly "bot" has evolved into something that can in fact be an agent of malicious intent. Today, bots come in many different forms, sometimes harmless, sometimes beneficial, but more often than not - festering with malicious intent and backed by sophisticated botnets.
The harm caused by bots can range from something mildly annoying (email harvesting for spam distribution) to something of major concern (Website Scrapers that steal website content) to something downright alarming (Distributed Denial of Service attacks), meaning that the threats posited by unmanaged bots far outweigh any benefits.
That said, it becomes easy to see why organizations need to come up with a plan to deal with bots, a methodology that lets harmless bots perform their master's bidding, while keeping malicious bots from achieving their nefarious goals. In theory, that sounds like it should be able to be an easy task to accomplish, but the truth reveals something much more insidious - malicious bots have the ability to mask themselves and hide within normal internet traffic, making detection difficult, if not impossible before the damage is done.
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