The BCG Matrix is a portfolio analysis tool developed by the Boston Consulting Group in the 1970s to help corporations analyze their business units, or Strategic Business Units (SBUs). It uses a 2x2 matrix, with relative market share on the x-axis and market growth rate on the y-axis, to categorize SBUs into four groups: Stars, Cash Cows, Question Marks, and Dogs. The document provides details on the emergence, components, applications, advantages, and limitations of the BCG Matrix model for analyzing corporate portfolios.