This is a short answer to your question. But much more detail is available online.
At one time there were 3 great traditions in Buddhism. These were Mahayana, Theravada, and Hinayana. Two traditions are still active today, Mahayana and Theravada.
In the Mahayana tradition a follower seeks to attain enlightenment not only for themselves but for the benefit of all sentient beings. These people are referred to as Bodhisattvas. The Mahayana tradition is the largest of the two Buddhist traditions active today. It was started sometime about 400 years after the Buddha's death. One of the great Masters of Mahayana was Nargajuna who taught on emptiness.
The Theravada tradition was started after the Third Council after The Buddha's death. This council was held to remove some heretical beliefs and writings from the scriptures that were seeping into the teachings. The Buddha's teachings were written down and approved by this council and is know as the "Teachings of the Elders". The main goal of a Theravadan is to attain Buddha-hood. It is the oldest school and the one most closest to the early Buddhism.
Hinayana tradition was for those who for seek enlightenment for themselves, but Hinayanists developed a set of rules that only a person who reincarnated as a man and become a Monk could attain enlightenment, which goes against The Buddha's teachings. As of today, there are no schools of tradition for Hinayana. It is effectively a dead tradition.
Mahayana is longer and easier path towards enlightenment and Vajrayana is quicker and more harsh and hardworking path towards the achievement of enlightenment.
The main difference between Theravada and Mahayana Buddhism is their approach to enlightenment. Theravada focuses on individual realization and self-liberation, while Mahayana emphasizes compassion and the idea of helping all beings achieve enlightenment. Additionally, Mahayana includes a wider range of texts and practices than Theravada.
In Mahayana Buddhism, a distinction is made between relative truth and absolute truth.
The difference in the concept of Arhat and the Mahayana concept of the Boddhisatva is the difference in the set of obscurations.
it's different beliefs and religion
well...it's a hard one. Tibet is a Buddhism hollyland,I suggest you go there and find out yourself.'Cause the most important meaning of Buddhism can never described.
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religion
Buddhism encompasses several sects that hold a wide range of beliefs, with core Buddhist concepts. The Tibetan branch of Buddhism contains animistic and shamanistic elements. Tibetan Buddhists believe that when the Dalai Lama and the Panchen Lama die, they are re-incarnated in this world, for them to follow again. So, the present Dalai Lama is the re-incarnation of his predecessor.
Both Zen and Amida are forms of Mahayana Buddhism. Zen is the Japanese form of Ch'an Buddhism and is found in several schools (Soto, Rinzai, & Obaku Zen). Zen is called the "Sudden Teaching" as it endeavours to bring forth enlightenment (Satori or Kensho) by living and focusing on the here and now. Amida or "Pure Land" Buddism is found in Japan in Jōdo-shū, Jōdo Shinshū and Shingon sects. It is an esoteric form of Buddhism that focuses on ritual, visualization and mantras.
There is no similarity between Buddhism and Hinduism though both of them are originated from India. Main difference is Hinduism believes in existence of God while Buddhism dont.