One of the many great features that we provides is protection from Distributed Denial of Service (DDoS) attacks. A malicious party who wants to make your website or web service unavailable could try to overwhelm it with requests from compromised machines (or bots) all around the world. With a large enough volume of requests, your server may become overloaded and not be able to provide its services to legitimate clients. This is the typical scenario in a denial of service attack.
The attacking machines use the public domain name service (DNS) to look up the IP address that hosts your domain (www.sample.com) and send their traffic to that machine hoping to shut it down.
When someone attempts to look up who hosts your domain, DNS will return an IP address in our network. If an attacker tries to take down your site, their traffic will go to our machines around the world instead of directly to your web server. Our network acts as a filter to block bad traffic and only send legitimate traffic through to your origin server.