Short answers, pulled from the story.
The WB Television Network launched on the 11th of January 1995, and aired its final night of programming on the 17th of September 2006, an eleven-year run. Its first program was the debut episode of The Wayans Bros.
The WB's mascot was Michigan J. Frog, the classic Warner Bros. cartoon character. He was retired in 2005 because network president of entertainment David Janollari said the frog perpetuated a young-teen image that The WB was trying to move away from as it sought a broader audience.
7th Heaven drew the network's all-time peak audience, with its the 8th of February 1999, episode attracting 12.5 million viewers. Dawson's Creek held the record for highest-rated premiere when it debuted in January 1998, until Smallville broke it by opening to 8.4 million viewers in October 2001.
By late 2005, The WB was losing money, had laid off approximately 40 employees, and expected to lose about $35 million in the 2005-06 fiscal year. Both The WB and UPN had fallen behind Univision in the 18-34 demographic. CBS Corporation and Warner Bros. announced on the 24th of January 2006, that they would shut down both networks and launch The CW.
Seven WB series moved to The CW for its inaugural 2006-07 season: 7th Heaven, Beauty and the Geek, Gilmore Girls, One Tree Hill, Reba, Smallville, and Supernatural. Supernatural ran the longest, completing its fifteenth season in fall 2020.
Warner Bros. relaunched TheWB.com as a free, ad-supported streaming website that began beta testing on the 28th of April 2008, and officially launched on the 27th of August 2008. The site streamed episodes of classic WB series and original short-form web content before shutting down in December 2013.