The term national news refers to stories about events, issues or developments that impact the entire country or have significant nationwide implications. This includes politics, the economy and major disasters.
A news agency prepares hard and feature news articles that can be used by newspapers, magazines and radio and television stations without much (or any) modification, and sells them to these media outlets in bulk. They may also supply information to corporations, individuals, analysts and intelligence agencies. A news agency usually employs a staff of reporters, known as stringers, who are freelancers who write for several different publications at once, but do not receive a regular salary.
News agencies are commonly referred to as a newswire or wire service. They are an essential part of the news business, and their primary clients are news organizations, including print and online, TV and radio broadcasters, and cable and satellite channels. Some also provide information to other industries, such as real estate and finance.
As for news aggregators, the largest and most-used are Google News (34% of Americans say they very often use it), Apple News (17%) and Facebook (15%). A smaller share of Americans name NPR or The Washington Post as their main news source. There is very little partisan overlap among the national outlets that Democrats and Republicans trust more than distrust, with only The Weather Channel being seen as somewhat bipartisan. On the other hand, three outlets are more distrusted than trusted by both parties: the National Enquirer, Infowars and OAN.