News can be broadly classified into two categories:

• Periodic or Recurring: This includes the scheduled releases of news that moves the markets, including interest rate announcements by the Federal Reserve, economic data releases, and quarterly earnings reports from companies.
• Unexpected or One-Time: These are bolts from the blue such as a terrorist attack, a sudden geopolitical flare-up, or the threat of debt default by an indebted nation. As a rule of thumb, unexpected news is more likely to be bad than good.

https://www.investopedia.com/articles/active-trading/111313/how-trade-news.asp