Warner Brothers Pictures was established by brothers Harry, Albert, Samuel, and Jack Warner in 1923. The company became a pioneer in early sound films and was producing about 100 films per year by the 1930s.
Eventually, it became two separate entities, Warner Communications and Warner Bros. Inc. Warner Communications merged with Time Inc. to form Time Warner in 1990, with Warner Bros. becoming its own division in the new company. AT&T acquired Time Warner in 2018 for around $85 billion and renamed it WarnerMedia.
Meanwhile, Discovery was founded in 1985. In addition to the Discovery Channel, it owned Animal Planet, Science Channel, and TLC. It acquired Scripps Networks Interactive in 2018, adding the Food Network, Travel Channel, and HGTV to its lineup.