Generally, Buddhists do not consider Gautama Buddha-who lived from about 623 BC to 543 BC and attained enlightenment around 588 BC--to have been the first or the last Buddha. From the standpoint of classical Buddhist doctrine, a Buddha is anyone who rediscovers the Dharma and achieves enlightenment, having amassed sufficient positive karma to do so. There have existed many such beings in the course of cosmic time. Hence, Gautama Buddha (known by the religious name Shakyamuni) is one member of a spiritual lineage of Supreme Buddhas going back to the dim past and forward into the distant future. According to the Tripitaka, for instance, Gautama Buddha was the 28th Buddha. His immediate predecessor was Dipankara Buddha, and his successor will be named Maitreya.

Buddhism recognises three types of Buddha, of which the simple term Buddha is normally reserved for the first type, that of Samyaksam-buddha (Pali: Samma-Sambuddha). The attainment of Nirvana is exactly the same, but a Samyaksam-buddha expresses more qualities and capacities than the other two.

The historical Buddha seems to have presented himself not as a god or savior, but as a teacher capable of guiding sentient beings out of samsara. Nevertheless, many forms of Buddhism do recognize god or savior figures. The technical differences between Buddhas, bodhisattvas, dharmapalas (protector deities), yidams ("tutelery deities"), and "gods" (Sanskrit deva, Tibetan lha) often blur in practical devotion.

A Tang Dynasty sculpture of Amitabha Buddha, found in the Hidden Stream Temple Cave, Longmen Grottoes, China indicates.

The awakened bliss of Nirvana, according to Buddhism, is available to all beings—although orthodoxy holds that one must first be born as a human being. Emphasizing this universal availability, Buddhism refers to many Buddhas and also to many bodhisattvas - beings committed to Enlightenment, who vow to

(from the Nikaya view) postpone their own Nirvana in order to assist others on the path, or
(from the Mahayana view) secure Awakening/Nirvana for themselves first and thereafter continue to liberate all other beings from suffering for all time.

Eternal Buddha
The idea of an everlasting Buddha is a Mahayana notion popularly associated with the Mahayana Buddhist scripture, the Lotus Sutra. That sutra has the Buddha indicate that he became Awakened countless, immeasurable, inconceivable myriads of trillions of aeons ("kalpas") ago and that his lifetime is "forever existing and immortal". From the human perspective, it seems as though the Buddha has always existed. The sutra itself, however, does not directly employ the phrase "eternal Buddha"; yet similar notions are found in other Mahayana scriptures, notably the Mahaparinirvana Sutra, which presents the Buddha as the ultimately real, eternal ("nitya"/ "sasvata"), unchanging, blissful, pure Self (Atman) who, as the Dharmakaya, knows of no beginning or end. The All-Creating King Tantra additionally contains a panentheistic vision of Samantabhadra Buddha as the eternal, primordial Buddha, the Awakened Mind of bodhi, who declares: "From the primordial, I am the Buddhas of the three times [i.e. past, present and future]." The notion of an eternal Buddha perhaps finds resonance with the earlier idea of eternal Dharma/Nirvana, of which the Buddha is said to be an embodiment.

The doctrine of an eternal Buddha is not, however, a feature of Theravada Buddhism. The Elders' School of Buddhism, which claims to preserve the original teachings of the Buddha from the first great recital (the second led the way to the division into Theravada and Mahayana), places great value on the Master's words that 'none is eternal', and believes that even the life of an enlightened one does indeed have an end.

Also appearing in Theravada is the notion of anatta as one of the 'trilakshana'(the three characteristics of reality): this embodies the idea that there is no definite, fixed, unchanging entity constituting a "person" that passes from one life to the next; Theravadin interpretation (along with that of most other Buddhist schools) of "anatta" also denies the existence of a fixed, unchanging, everenduring personal soul. The concept in place of the soul is the 'Bhava' ("becoming"), which is an ongoing flow of karmically projected energies that derive from, and give rise to, volitional thoughts and emotion.

Mahayana Buddhism, however, regards such teaching as incomplete and offers the complementary doctrine of a pure Selfhood (the eternal yet unsubstantial hypostasis of the Buddha) which no longer generates karma and which subsists eternally in the realm of Nirvana, from which sphere help to suffering worldly beings can be sent forth in the forms of various transitory physical Buddhas ("nirmanakayas"). While the bodies of these corporeal Buddhas are subject to disease, decline and death - like all impermanent things - the salvational Tathagata or Dharmakaya behind them is forever free from impairment, impermanence or mortality. It is this transcendent yet immanent Dharmakaya-Buddha which is taught in certain major Mahayana sutras to be immutable and eternal and is intimately linked with Dharma itself. According to the Mahayana Mahaparinirvana Sutra, worldly beings fail to see this eternality of the Buddha and his Truth (Dharma). The Buddha comments there: "I say that those who do not know that the Tathagata [Buddha] is eternal are the foremost of the congenitally blind." This view, it should be noted, is foreign to mainstream Theravada Buddhism.