SmithKline, historically part of the pharmaceutical company SmithKline Beecham, was a multinational corporation involved in the development, manufacture, and marketing of pharmaceuticals, vaccines, and consumer healthcare products. The company played a significant role in the global marketplace through its extensive research, development of innovative healthcare solutions, and strategic mergers and acquisitions before merging with Glaxo Wellcome to form GlaxoSmithKline (GSK) in 2000.