BusinessDecision is a robust tool for businesses and entrepreneurs seeking business-to-consumer market data. It contains company profiles, product/brand information, and market share data. Recently enhanced to include the latest data for 2015/2020 and thematic mapping capabilities, it's sure to be useful for beginners through expert users.
BusinessDecision is one of several free databases offered by MeL. Just go to www.mel.org/databases to get started.