The Enlightenment, spanning the late 17th to 18th centuries, marked a shift towards reason and individualism in Europe and North America. This era challenged traditional authority, emphasizing human rationality and progress while laying the groundwork for modern concepts of democracy and human rights. Immanuel Kant, a key figure in this period, developed a critical philosophy that sought to reconcile rationalism and empiricism. His ethical theory, centered on the categorical imperative, continues to influence modern philosophical debates on morality, knowledge, and human experience.