I'm not in any way asking how to do this.

[PoseidonX43]

What is a DDOS Attack?
What is a DMCA Takedown Notice?

[Suicune]

I'm not exactly sure about DDOS.

A DMCA Takedown Notice is a Digital Millennium Copyright Act Takedown Notice.
So pretty much a legal copyright infringement notice of anything that violates copyright on the internet.

[Commander Thor]

What is a DDOS Attack?
A DDOS attack is a Distributed Denial of Service Attack.
It's pretty much what it sounds like; a number of computers (The more computers, the more effective the attack will be) all start trying to load something from (Or send something to) a computer, server, or group of servers to try and max out it's internet connection. Essentially rendering it unusable.

More info here: http://en.wikipedia.org/wiki/Denial-of-service_attack
What is a DMCA Takedown Notice?
See Mford's post.

[PoseidonX43]

Thanks for the answers.