Free ad-supported streaming television
Free ad-supported streaming television (FAST) is a category of streaming television services, akin to linear or cable TV, represented by platforms such as Pluto TV and Samsung TV Plus. These services offer traditional television programming and studio-produced movies without a paid subscription, funded exclusively by advertising. They stand apart from platforms predominantly featuring user-generated content like YouTube and Twitch, as well as from subscription-based ad-supported services like Hulu and Netflix. FAST services have both linear channels (sometimes referred to as "FAST channels") and video on demand content. The earliest documented use of the term was in a December 2018 article by media analyst Alan Wolk about Pluto TV. Wolk came up with the term as a way to differentiate between subscription ad-supported streaming TV services like Hulu and free ad-supported linear streaming TV services like Pluto TV. Platforms 
The FAST ecosystem has several layers. The best-known FASTs are the aggregators, which fall into three categories. FASTs owned by major media companies: Paramount's Pluto TV, Fox's Tubi, Charter Communications and Comcast's Xumo, Dish Network's Sling Freestream, and ITV’s ITVX service. FASTs owned by device manufacturers: Amazon Freevee (previously IMDb TV), The Roku Channel, Samsung TV Plus, LG Channels, Vizio WatchFree+, and TCL Electronics' TCL Channel. Independent FASTs: Plex, Chicken Soup for the Soul Entertainment’s Crackle, Mometu, Herogo TV, and Flixhouse. These aggregators operate primarily in the United States as of 2022, though some, like Pluto TV, Plex, and Samsung TV Plus operate in additional countries or worldwide. In addition to aggregator apps, there are FASTs run by a single provider such as E.W. Scripps' Scripps News, PocketWatch and FilmRise that also provide their content for use in linear channels on the aggregator apps. Content and channels 
Content on FAST services can potentially cover all television genres as well as movies, which are the most popular type of content on the FASTs. Content options can include original and/or archive programming not available through subscription streaming services. Although many linear channels on FAST services resemble cable-style specialty channels, some have an even narrower focus on a single long-running program or media franchise. While some linear FAST channels are exclusive to specific platforms, some, such as Cheddar, are distributed through multiple providers. FASTs owned by major media companies have the advantage of being able to leverage their parent companies extensive libraries. Variety estimated that 1,455 linear channels were available through major FAST platforms as of June 2022. Growing popularity 
As per Nielsen's monthly streaming ratings for the US market, called The Gauge, three of the FAST services are now in the Top 10 of all streaming services. As of the September 2023 ratings, Tubi, with 1.3% of viewing, ranks fifth among all streaming services, The Roku Channel, with 1.1% ranks seventh, and Pluto TV, with 0.8% ranks tenth. [While The Gauge consistently shows YouTube to be the most watched streaming service on television sets, there is much debate in the industry as to whether YouTube, with its preponderance of user-generated content, is actually "TV".] References 

Streaming television
Internet broadcasting
New media