The Ottomans, like other cultures and empires throughout history, adopted and developed curved swords for various reasons. The use of curved swords by the Ottomans, particularly the iconic kilij, was influenced by a combination of cultural, practical, and historical factors:

1. Cultural and Symbolic Significance: Curved swords held cultural and symbolic significance in many societies, including the Ottoman Empire. The curved blade of the kilij became associated with prestige, power, and martial prowess, reflecting the warrior ethos of the Ottomans. These swords were often seen as symbols of authority and status, worn by Ottoman soldiers and elite warriors.
2. Effective Cutting Weapon: The curved shape of the kilij allowed for effective cutting and slashing motions. The curve created a longer cutting edge, which enhanced the sword's cutting ability. This was advantageous in close-quarters combat and mounted warfare, where slashing attacks could cause devastating cuts and incapacitate opponents.
3. Versatility in Different Combat Scenarios: The curved blade of the kilij offered versatility in various combat scenarios. It allowed for powerful swings and strikes, suitable for both on-foot combat and mounted warfare. The curve enabled effective cutting from horseback, where the swinging motion of the sword could be utilized with maximum efficiency.
4. Influence of Historical and Cultural Factors: The Ottomans drew influence from various cultures and military traditions, adapting and incorporating weapons from different regions they encountered. The curved swords used by neighboring cultures, such as the Persian shamshir and Arab saif, may have influenced the Ottomans in the development of their own curved sword designs.

It's important to note that the Ottoman Empire spanned several centuries, and sword designs evolved and changed over time. While the curved kilij was prominent during certain periods, the Ottomans also used a variety of other weapons, including straight swords, spears, and firearms, as their military technology advanced.

Overall, the adoption of curved swords by the Ottomans was a combination of practical considerations, cultural symbolism, and historical influences, which contributed to their prominence and recognition in Ottoman military culture.