The Ottoman Empire was a powerful and expansive Islamic state that existed from the late 13th century until the early 20th century. At its height, the empire spanned three continents and was a major political and cultural force in the world. Research on the Ottoman Empire typically focuses on topics such as its political structure, military campaigns, economic system, social hierarchy, and cultural achievements. Scholars also explore the empire's interactions with neighboring states, its influence on world events, and the factors that led to its eventual decline and dissolution. The Ottoman Empire has had a lasting impact on the history of the Middle East, Europe, and the broader world, making it a rich and complex subject of study.