Kittens are adorable, vulnerable young cats requiring specialized care, marked by stages from newborn blindness/deafness to energetic exploration, needing proper nutrition (kitten food, not cow's milk), socialization, vet care (vaccines, spay/neuter), and a stimulating environment for play, scratching, and rest. Their "cute" features like big eyes trigger nurturing instincts, but owners must manage their boundless energy, especially between 4-6 months, through training and providing safe outlets for natural behaviors like pouncing and climbing, ensuring a healthy start.