Ultrabooks are lightweight, thin laptops that are designed to be highly portable and responsive. Intel first introduced Ultrabooks to compete with tablets by making laptops that were thin and lightweight like tablets but with better performance and full laptop functionality. Ultrabooks use solid-state drives instead of hard drives for improved performance and battery life. Key Ultrabook models include the Samsung ATIV Book Series, Dell XPS 12, ASUS Zenbook, and Apple MacBook Air, with Ultrabook sales growing significantly in recent years.