When did the ninja exist?

Ninjas, or shinobi, primarily existed during Japan's feudal era, particularly from the 15th century to the 17th century. They were often associated with the Sengoku period (1467-1603), a time of constant military conflict, where their skills in espionage, guerrilla warfare, and stealth were highly valued. While their existence is often romanticized in popular culture, historical records suggest that they operated in various capacities, including as spies and assassins, during this tumultuous period in Japanese history.