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.
為了執行這些攻擊並偽裝攻擊流量的來源，惡意傀儡程式可能會在殭屍網路中散佈，代表傀儡程式的副本會在多個裝置上執行，且裝置擁有者通常不知情。因為每個裝置擁有自己的 IP 位址，所以殭屍網路流量來自大量不同的 IP 位址，造成難以識別和封鎖惡意傀儡程式流量的來源。
To learn more about setting up bot protection, see our Developer documentation.