what is ddos attack?

[rossey]

My websites are going down and coming up frequently

I asked my provider. They said they are having DDoS attack. What is this? How do i now save my sites?

can some professional give me a clear explanation whats a DDOS attack?

[wesen]

DDoS or Distributed Denial of Service occurs when an attacker sending a lot of traffic at the server at once, therefore blocking legitimate traffic (and making the site go offline). Further read on how DDoS works and common types of DDoS: https://www.casbay.com/blog/tips-sharing...dos-attack
However, your sites should be fine once they mitigate the attack.

[Niklas]

DDoS attacks are generally very hard to mitigate. It depends on the size tho.

[shawn]

In really simple terms, it spams the webserver with traffic until the webserver is "overloaded" with the requests and the requests from "real" customers will not be able to go through.