Korean Buddhism is distinguished from other forms of Buddhism by its attempt to resolve what it sees as inconsistencies in Mahayana Buddhism. Early Korean monks believed that the traditions they received from foreign countries were internally inconsistent. To address this, they developed a new holistic approach to Buddhism. This approach is characteristic of virtually all major Korean thinkers, and has resulted in a distinct variation of Buddhism, which is called Tongbulgyo ("interpenetrated Buddhism"), a form that sought to harmonize all disputes (a principle called hwajaeng 和諍) by Korean scholars. Korean Buddhist thinkers refined their predecessors' ideas into a distinct form.
As it now stands, Korean Buddhism consists mostly of the Seon lineage, primarily represented by the Jogye and Taego Orders. The Korean Seon has a strong relationship with other Mahayana traditions that bear the imprint of Chan teachings as well as the closely related Zen. Other sects, such as the modern revival of the Cheontae lineage, the Jingak Order (Korean: 大韓佛敎眞覺宗, 대한불교진각종, a modern esoteric sect), and the newly formed Won, have also attracted sizable followings.
Korean Buddhism has also contributed much to East Asian Buddhism, especially to early Chinese, Japanese, and Tibetan schools of Buddhist thought.
When Buddhism was originally introduced to Korea from Former Qin in 372, or about 800 years after the death of the historical Buddha, shamanism was the indigenous religion. As it was not seen to conflict with the rites of nature worship, Buddhism was allowed to blend in with Shamanism. Thus, the mountains that were believed to be the residence of spirits in pre-Buddhist times became the sites of Buddhist temples.