This document provides an overview of the Boston Consulting Group (BCG) Matrix, which was developed in the 1970s to help companies analyze their business units. The BCG Matrix classifies business units into four categories - Stars, Cash Cows, Question Marks, and Dogs - based on their relative market share and the market growth rate. Stars have high market share in a high-growth market, while Cash Cows have high share in a low-growth market. Question Marks have low share but are in a high-growth market, while Dogs have low share and are in a low-growth market. The matrix is used to assess cash flows, resource allocation, and determine whether to invest in or divest from different business units