The word Zen in Japanese means "empty" or "meditation." In ancient Japan, Zen had a major impact on samurai warriors, and it was widely adopted as their official spiritual practice.
Zen emphasizes the personal expression of experiential wisdom in the attainment of Satori commonly translated as “enlightenment” through the practice of Zazen "seated meditation," contemplation of koans (stories, dialogues, questions, or statements used to provoke the "great doubt") and interaction with an accomplished teacher.
Zen expressions refer to enlightenment as "seeing your self-nature." But even this is not enough. After seeing your self-nature, you need to deepen your experience even further and bring it into maturation. You should have enlightenment experiences again and again and support them with continuous practice.