What is the difference between CBS Corporation and viacom?

CBS Corporation and Viacom were two separate entities that merged in 2019 to form ViacomCBS, later rebranded as Paramount Global. CBS Corporation primarily focused on broadcasting and television, including the CBS network and various cable channels. In contrast, Viacom was known for its extensive portfolio of media properties, including MTV, Nickelodeon, and Paramount Pictures. The merger aimed to combine their strengths in content creation and distribution across multiple platforms.