In computing, a Denial-of-Service (DoS) attack is an attempt to make a machine or network resource unavailable to its intended users, such as to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet.
What is Distributed Denial of Service (DDoS)?
A Distributed Denial-of-Service (DDoS) is where the attack source is more than one–and often thousands of-unique IP addresses.
The Difference Between DoS and DDos Attacks
A Denial-of-Service (DoS) attack is different from a DDoS attack. The DoS attack typically uses one computer and one Internet connection to flood a targeted system or resource. The DDoS attack uses multiple computers and Internet connections to flood the targeted resource. DDoS attacks are often global attacks, distributed via botnets.