Gifted children are naturally endowed with high general mental ability or extraordinary ability in a specific field. They require services beyond normal schooling to develop their capabilities. Characteristics include high IQ, self-motivation, independence, and social/emotional adjustment above peers. Disadvantaged children face challenges like poverty, disability, or lack of stimulation. They have lower achievement and self-belief. Types include socially deprived, economically deprived, educationally deprived, and physically disabled children.