What is Fake News?

CNN is one of the news networks Trump calls Fake News.

Trump was offended by a question CNN’s report Jim Acosta.

A lady tried to take the mike away from Acosta.

Acosta’s Whitehouse press credentials was take away from him.

The Whitehouse altered the video of the lady trying to get the mike from Acosta, making  him look more aggressive than he was.
Experts said the video was doctored.  Trump said it wasn't doctored.
Kellyanne Conway, counselor to the president said it was.

Wouldn’t the altering of the tape fall under the heading of “Fake News”?