The BCG matrix is a tool used to evaluate a company's portfolio of business units based on their relative market share and market growth rate. It categorizes units as stars, cash cows, question marks, or dogs. For Pran, ketchup is classified as a star due to its market share of 7.6% in a high growth market. Spice powder is a question mark with low market share but a growth rate of 11%. Frooto is a cash cow with steady growth and a 5.8% market share. Power drink is labeled a dog with only 1% market share and slow growth.