Group D refers to a classification used in various contexts, such as sports tournaments or scientific categorizations. In sports, it often denotes a specific set of teams competing against each other in a league or championship, like the FIFA World Cup or UEFA European Championship. Each group typically consists of four teams that play in a round-robin format. In scientific contexts, Group D can refer to a category in the Periodic Table of Elements, where certain elements share similar properties. For example, it may include transition metals known for their ability to conduct electricity and heat. Understanding these classifications helps in organizing information systematically.