The document discusses the BCG matrix, a portfolio management tool developed by the Boston Consulting Group. The BCG matrix analyzes businesses based on their relative market share and growth rate, categorizing them as stars, cash cows, question marks, or dogs. It helps companies allocate resources by understanding which business units require investment, generate cash, or need restructuring. However, the BCG matrix also has limitations as it only considers two factors and does not account for synergies between business units.