What is Content Automation?

Tell me about the word "Content Automation". How could it helpful for content marketing. Why to use content automation and how can I use/do content automation for my website?
Also, let me know differences between, CopyWriting, Content Writing, Content Marketing and Content Automation?

Content automation tools serve as a cannon fodder for automated linkbuilding campaigns. Not as a money site content.

Simply am explaining here

Content Writing - Create own informative content by quality writers.
Content Marketing - Get backlinks from any published content.
Copy Writing - Already written articles have copywriting so we don't use the article again.
Content Automation - It is a tool, it does not provide quality contents, so am not recommending to you.

All of the above, plus one more:
- if you don't care to maximize your chances to rank in google, and you have your own sources of traffic (social media, ads, etc) you can use scraped or scraped and spinned content on your money site.
Otherwise for linkbuilding can be useful.