Tendai, also known as Japanese Tiantai, is a school of Buddhism that originated in Japan in the 9th century. It is based on the teachings of the Chinese Buddhist master, Zhiyi, who founded the Tiantai school in China. Tendai is considered to be a synthesis of various Buddhist teachings, incorporating elements from Mahayana, Theravada, and Vajrayana traditions.

One of the key aspects of Tendai is its belief in the concept of "One Vehicle" or "One Dharma," which states that all beings have the potential to attain enlightenment and that all Buddhist teachings ultimately lead to the same goal. This belief is shared by other Mahayana schools such as Zen and Pure Land, which also emphasize the universality of Buddhist teachings.

Tendai also shares many similarities with the Theravada tradition, particularly in its emphasis on the importance of meditation and the Four Noble Truths. However, Tendai places a greater emphasis on the role of ritual and devotion, which is similar to the Vajrayana tradition.

Despite these similarities, Tendai has its own unique teachings and practices that set it apart from other schools of Buddhism. One of the key differences is its incorporation of Shintoism, the indigenous religion of Japan. Tendai followers believe that Shinto deities are manifestations of Buddha nature and therefore can be worshipped alongside Buddhist deities. This syncretic approach to religion is not found in other schools of Buddhism.

Tendai also has a strong focus on the Lotus Sutra, which is considered to be the ultimate teaching of the Buddha. This text is highly revered in Tendai and is seen as the key to understanding all other Buddhist teachings. This emphasis on the Lotus Sutra is not shared by other schools of Buddhism, making Tendai unique in its approach.

Despite these differences, Tendai maintains a harmonious relationship with other schools of Buddhism. In fact, Tendai has been influential in the development of other Japanese Buddhist schools, such as Nichiren and Shingon. Tendai also has a long history of dialogue and exchange with other traditions, such as Zen and Pure Land.

In conclusion, Tendai shares many similarities with other schools of Buddhism, particularly in its belief in the universality of Buddhist teachings. However, it also has its own unique teachings and practices that set it apart. Despite these differences, Tendai maintains a harmonious relationship with other schools of Buddhism and continues to play a significant role in the development of Japanese Buddhism.