Distributed Denial Of Service (DDoS) attack :
DDoS stands for “Distributed Denial of Service.” A DDoS attack is a malicious attempt to make a server or a network resource unavailable to users, usually by temporarily interrupting or suspending the services of a host connected to the Internet.
Unlike a Denial of Service (DoS) attack, in which one computer and one internet connection is used to flood targeted resource with packets, a DDoS attack uses many computers and many Internet connections, often distributed globally in what is referred to as a botnet.
These DDOS attacks will be received from two or more people,and in 2014 the frequency is reached to an average rate of 28 per hour. The High profiled Web Services or Websites are the main objective for the DDOS attackers, which will cause the Website or Web service unavailable for certain period of time or permanently. It was seen mostly on Server which is Completely used for games, E-commerce, Online media or news sites, and etc.