Chan Buddhism, also known as Original Chinese Zen, is a form of Buddhism that originated in China and is known for its emphasis on meditation and direct experience of enlightenment. It is different from other forms of Buddhism in several ways.

Firstly, Chan Buddhism places a strong emphasis on the practice of meditation, specifically the method of "silent illumination" or "just sitting". This practice involves sitting in meditation without any specific object of focus, allowing the mind to become calm and clear. This is in contrast to other forms of Buddhism that may use various objects of focus, such as mantras or visualizations, in their meditation practice.

Secondly, Chan Buddhism emphasizes the direct experience of enlightenment over studying and intellectual understanding. This is reflected in the famous saying "A special transmission outside the scriptures, not relying on words and letters; pointing directly to the mind, seeing into one's nature and attaining Buddhahood." In other words, enlightenment is not something that can be taught or learned through words or scriptures, but can only be realized through direct experience.

Another significant difference is the role of the teacher in Chan Buddhism. In other forms of Buddhism, the teacher is seen as a guide and authority figure, but in Chan Buddhism, the teacher is seen as a catalyst for the student's own realization. The teacher may use unconventional methods, such as shouting or hitting, to help the student break through their conceptual thinking and experience enlightenment.

In addition, Chan Buddhism emphasizes the concept of "sudden enlightenment", in which one can attain enlightenment in a single moment, rather than through gradual practice and accumulation of merit. This is in contrast to other forms of Buddhism that may focus on the gradual path of accumulating merit and wisdom through various practices.

Furthermore, Chan Buddhism also incorporates elements of Taoism and Chinese culture, such as the use of koans (paradoxical riddles) and the concept of "wu wei" (effortless action), which are not found in other forms of Buddhism.

In summary, Chan Buddhism differs from other forms of Buddhism in its emphasis on meditation, direct experience of enlightenment, the role of the teacher, the concept of sudden enlightenment, and incorporation of Taoism and Chinese culture. Its unique approach has made it a popular and influential form of Buddhism, not only in China but also in other parts of the world.