机器人是一种 Internet 运行软件程序，执行的是重复性任务。 虽然某些机器人流量来自于善意机器人，但恶意机器人会给网站或者应用程序带来巨大的负面影响。
A bot is a software application that is programmed to do certain tasks. Bots are automated, which means they run according to their instructions without a human user needing to manually start them up every time. Bots often imitate or replace a human user's behavior. Typically they do repetitive tasks, and they can do them much faster than human users could.
Bots usually operate over a network; more than half of Internet traffic is bots scanning content, interacting with webpages, chatting with users, or looking for attack targets. Some bots are useful, such as search engine bots that index content for search or customer service bots that help users. Other bots are "bad" and are programmed to break into user accounts, scan the web for contact information for sending spam, or perform other malicious activities. If it's connected to the Internet, a bot will have an associated IP address.
Any automated actions by a bot that violate a website owner's intentions, the site's Terms of Service, or the site's Robots.txt rules for bot behavior can be considered malicious. Bots that attempt to carry out cybercrime, such as identity theft or account takeover, are also "bad" bots. While some of these activities are illegal, bots do not have to break any laws to be considered malicious.
In addition, excessive bot traffic can overwhelm a web server's resources, slowing or stopping service for the legitimate human users trying to use a website or an application. Sometimes this is intentional and takes the form of a DoS or DDoS attack.
为实施此类攻击并伪装攻击流量源，恶意机器人可能分布于僵尸网络中，这意味着机器人副本在多台设备上运行，而设备用户往往对此毫无所觉。因每台设备有自己的 IP 地址，故而僵尸网络流量由大量不同的 IP 地址产生，这使得识别恶意机器人流量源并加以阻止难上加难。
To learn more about setting up bot protection, see our Developer documentation.