Zen (Chan) is a school of Mahayana Buddhism that originated in China during the 6th century. It is based on the teachings of the Indian monk Bodhidharma, who is considered the founder of Zen Buddhism. The word "Zen" comes from the Chinese word "Chan," which means meditation.

At its core, Zen emphasizes the practice of direct experience and meditation over the study of scriptures. This means that Zen practitioners focus on being fully present in the moment and experiencing reality directly, rather than relying on written teachings or beliefs.

One of the key principles of Zen is the concept of "satori," or sudden enlightenment. This refers to a moment of awakening or realization that can occur during meditation or through other experiences. Zen practitioners strive to achieve satori through intense and focused meditation, as well as through everyday activities.

In Zen, there is a strong emphasis on the role of the teacher, known as a "roshi." The roshi is seen as a guide and mentor on the path to enlightenment, and their role is to help students deepen their understanding and practice of Zen. The relationship between a student and their roshi is based on trust, respect, and a deep commitment to the practice of Zen.

One of the unique aspects of Zen is its use of koans, which are paradoxical statements or questions that are meant to challenge the mind and push it beyond conventional thinking. Koans are used as a tool for meditation and can help practitioners break through mental barriers and reach a state of satori.

In Zen, there is also a strong emphasis on mindfulness and simplicity. This can be seen in the minimalist and serene design of Zen temples, as well as in the practice of mindfulness in everyday activities such as eating, walking, and working.

Overall, Zen (Chan) is a practice that emphasizes living in the present moment, experiencing reality directly, and achieving enlightenment through meditation and direct experience rather than through the study of scriptures. It is a profound and transformative path that has influenced many aspects of Eastern and Western culture and continues to be a source of inspiration and guidance for many people today.