Philosophers of the Enlightenment were thinkers in the 17th and 18th centuries who emphasized reason, individualism, and skepticism of traditional authority. They sought to apply rational thought to all areas of human activity, including politics, religion, and education, leading to revolutionary ideas that challenged the established norms of their time. Their works laid the intellectual groundwork for modern democratic thought and played a pivotal role in shaping 18th-century culture and arts.