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A bot is common parlance on the Internet for a software program that is a software agent. A bot interacts with other network services intended for people as if it were a person. One typical use of bots is to gather information. The term is derived from the word "robot," reflecting the autonomous character in the "virtual robot"-ness of the concept. The most common bots are those that covertly install themselves on people's computers for malicious purposes, and that have been described as remote attack tools. More generally they are web software agents that interface with web pages. Web crawlers or spiders are web robots that recursively gather web-page information, as does the bot used by Google ("GoogleBot"). They may also be used to interact dynamically with a site in a particular way, as by exploiting or locating arbitrage opportunities for financial gain.