The BCG matrix uses two dimensions to categorize products or services: relative market share and market growth rate. Relative market share measures how well you compete with your rivals in the same market, while market growth rate measures how fast the market is expanding or contracting. These dimensions separate products or services into four groups: Stars, Cash Cows, Question Marks, and Dogs. Stars are high-growth, high-share products or services that have a strong position in a fast-growing market and generate high revenues and profits; however, they require high investments to maintain or increase their market share. Cash cows are low-growth, high-share products or services that have a dominant position in a mature or slow-growing market and generate steady cash flows and profits. Question marks are high-growth, low-share products or services that have a weak position in a fast-growing market and require high investments to grow or survive. Finally, dogs are low-growth, low-share products or services that have a marginal position in a stagnant or declining market and generate low revenues and profits. They may even incur losses or drain resources, so they should be avoided or eliminated.