Google Alerts have been providing email updates on your topic or query of interest since all the way back in 2003. Google've now made some improvements in the quantity, freshness and relevance of the content that're send you.
Google says "We've found many people are specifying general topics like "finance," "entertainment" or even simply "news." Up until this week, Alerts would return a long list of content from across the web about these very broad topics. This worked, but we realized it's probably much more helpful to send you the corresponding section from Google News, since it seems like you're looking for a digest of the big topics of the day.
So, we're now "including News sections in Alerts" if you enter one of the following terms like: news, world news, business, entertainment, finance, health, science, sports or technology. This allows you to have your favorite part of Google News delivered to your inbox every morning."