Attack on the availability of websites or other internet services. These services are overloaded by a large number of requests.
A DDoS (distributed denial of service) is a type of attack on computer systems with the aim of making them unavailable. The volume of data often reaches several hundred Gbit/s. Generally, a single organisation cannot cope with volumes of this size without external assistance. Firewalls and IPS (intrusion prevention systems) that have been configured accordingly offer only limited assistance.