This from Britannica on line.
bodhisattva, in Buddhism, one who seeks awakening (bodhi)—hence, an individual on the path to becoming a buddha.
Pali: bodhisatta (“one whose goal is awakening”)
In early Indian Buddhism and in some later traditions—including Theravada, at present the major form of Buddhism in Sri Lanka and other parts of Southeast Asia—the term bodhisattva was used primarily to refer to the Buddha Shakyamuni (as Gautama Siddhartha is known) in his former lives. The stories of his lives, the Jatakas, portray the efforts of the bodhisattva to cultivate the qualities, including morality, self-sacrifice, and wisdom, which will define him as a buddha. Later, and especially in the Mahayana tradition—the major form of Buddhism in Tibet, China, Korea, and Japan—it was thought that anyone who made the aspiration to awakening (bodhicittotpada)—vowing, often in a communal ritual context, to become a buddha—is therefore a bodhisattva. According to Mahayana teachings, throughout the history of the universe, which had no beginning, many have committed themselves to becoming buddhas. As a result, the universe is filled with a broad range of potential buddhas, from those just setting out on the path of buddhahood to those who have spent lifetimes in training and have thereby acquired supernatural powers. These “celestial” bodhisattvas are functionally equivalent to buddhas in their wisdom, compassion, and powers: their compassion motivates them to assist ordinary beings, their wisdom informs them how best to do so, and their accumulated powers enable them to act in miraculous ways.
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Avalokiteshvara
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Bodhisattvas are common figures in Buddhist literature and art. A striking theme in popular literature is that of the concealed greatness of the bodhisattvas. In numerous stories ordinary or even distinctly humble individuals are revealed to be great bodhisattvas who have assumed common forms to save others. The lesson of these tales is that, because one can never distinguish between paupers and divinities, one must treat all others as the latter. In popular folklore bodhisattvas appear as something like saviour deities, a role they acquired both through the evolution of earlier ideas and through fusion with already existing local gods.
Buddhism: Celestial buddhas and bodhisattvas
A particularly important mythology in East Asia is that of Dharmakara. According to the Pure Land Sutra, Dharmakara was a bodhisattva whose vows were realized when he became the Buddha Amitabha. Pan-Buddhist bodhisattvas include Maitreya, who will succeed Shakyamuni as the next buddha in this world, and Avalokiteshvara, known in Tibet as Spyan ras gzigs (Chenrezi), in China as Guanyin (Kuan-yin), and in Japan as Kannon. Although all bodhisattvas act compassionately, Avalokiteshvara is considered the embodiment of the abstract principle of compassion. Bodhisattvas of more localized importance include Tārā in Tibet and Jizō in Japan.
Dreamyoga 