A Distributed Denial of Service (DDOS) attack occurs when criminal gangs flood a website or server with requests so that the server is unable to respond to the volume of requests made.

In a DDOS attack, criminal gangs use software that they have installed on the computers of members of the public who have not protected their computers with firewalls and anti-virus software.

The attack is launched from thousands of computers which are used at different times to send different types of requests. This makes it difficult for a server to determine which requests are genuine and which are malicious. As the attack can change over time, it is difficult to eliminate.

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