The BCG Matrix, developed by Bruce Henderson in the 1970s, categorizes products into four types—stars, cash cows, question marks, and dogs—based on their market growth rate and relative market share. It aids in portfolio planning by identifying where to allocate investments for optimal profitability and growth, though it has limitations like reliance on only two metrics and potential data availability issues. The matrix helps businesses strategize but does not guarantee high profits solely from high market share.