DDoS is the abbreviation for "Distribution denial of service" in English, which means "distributed Denial-of-service attack".
This attack method uses the same method as an ordinary denial of service attack, but the source of the attack is multiple. Typically, an attacker uses a downloaded tool to penetrate an unprotected host, and after obtaining the appropriate access rights for that host, the attacker installs the software's services or processes (hereinafter referred to as proxies) in the host. These agents stay asleep until they get instructions from their main control. The primary control command agent initiates a denial-of-service attack on the specified target.
With the widespread use of cable modems, DSL and the harmful and powerful hacker tools, there are more and more hosts that can be accessed. A distributed denial of service attack means that the host can simultaneously launch thousands of attacks against a target. The power of a single denial-of-service attack may have no effect on a wide-bandwidth site, while thousands of of attacks across the globe can have deadly effects.