My friend working at Intel is planning to DDOS this server

What does the word DDOS mean?

Thanks!

Distributed denial of service. A kind of cyber-attack.
More here: Denial-of-service attack - Wikipedia

I hope this is just a sample sentence and not an actual threat to Lingq servers O_o

Ha ha yeah I was like, “Wait, what?”

I was about to say…I hope this is just an example sentence! I bet it is. We don’t know the potential person that would be behind the attacks, but no smart person would admit working for a specific company using company property to hack another company. 0_o