A decision tree is a visual representation of a decision-making process. It can be used for management purposes as it allows for a systematic analysis of various alternatives. Each branch of the tree represents a possible solution or consequence to the decision, and each branch can be broken down into its own set of potential solutions or consequences. It's beneficial for management as it allows for a thorough understanding of the possible paths of a project and a better comprehension of different outcomes. By visually displaying the options and possible outcomes, decision trees make it easy to determine which option is the best choice in any given situation.