I couldn't access a forum that I frequent and someone told me that the forum got DDoS-ed. What does that mean?
Answer:
DDoS (Distributed Denial of Service) attack is an attempt to stop your server from being able to run its normal operations, by flooding it with fake requests.
If a web server can handle a max of 1000 requests at any one time, for example, and if an attacker launch a DDoS attack by continuously sending more than 1000 random requests, then the server will no longer be able to respond to requests from other legitimate users.