A dog breed is a specific group of domestic dogs that share common characteristics, such as appearance, behavior, and temperament. Breeds are often developed for particular purposes, such as herding, hunting, or companionship. Each breed has its own unique traits, which can influence factors like size, coat type, and energy levels. There are hundreds of recognized dog breeds worldwide, categorized by organizations like the American Kennel Club (AKC) and the Fédération Cynologique Internationale (FCI). Popular breeds include the Labrador Retriever, known for its friendly nature, and the German Shepherd, valued for its intelligence and versatility.