The Boston Matrix is a tool used by businesses to analyze their product portfolio and determine which products are worth investing in and which ones should be discontinued or divested. It's a simple 2x2 matrix that looks at a product's market share (how much of the market it has) and the market growth rate (how fast the overall market is growing). There are four categories:

• Stars: High market share, high market growth rate. These are the products that are doing well and have a lot of potential for growth.
• Cash cows: High market share, low market growth rate. These are the products that are reliable money-makers but don't have much room for growth.
• Dogs: Low market share, low market growth rate. These are the products that are not performing well and should be discontinued or divested.
• Question marks: Low market share, high market growth rate.