A DDoS (Distributed Denial of Service) attack takes place when a group of hackers create a network and jointly send a high volume of requests to a web server. The combined load jams the web servers and prevents real users from accessing the sites. Business Insider, CNN, Imgur, The Guardian, PayPal, Pinterest, and the PlayStation Network websites were also down temporarily. Major websites across East Coast knocked out in apparent DDoS attack https://t.co/xwfGKRtOb4 — CNBC (@CNBC) October 21, 2016Dyn restored their services later in the day. But their capability to take down one of the providers of major websites indicates that they are well-equipped for further, bigger attacks in the future.

Source: Dhaka Tribune October 21, 2016 15:00 UTC