Academic study of Jewish mysticism, especially since Gershom Scholem's Major Trends in Jewish Mysticism (1941), draws distinctions between different forms of mysticism which were practiced in different eras of Jewish history. Of these, Kabbalah, which emerged in 12th-century southwestern Europe, is the most well known, but it is not the only typological form, nor was it the first form which emerged. Among the previous forms were Merkabah mysticism (c. 100 BCE – 1000 CE), and Ashkenazi Hasidim (early 13th century) around the time of the emergence of Kabbalah.
Kabbalah means "received tradition", a term which was previously used in other Judaic contexts, but the Medieval Kabbalists adopted it as a term for their own doctrine in order to express the belief that they were not innovating, but were merely revealing the ancient hidden esoteric tradition of the Torah. This issue has been crystalized until today by alternative views on the origin of the Zohar, the main text of Kabbalah, attributed to the circle of its central protagonist Rabbi Shimon Bar Yochai in the 2nd century CE, for opening up the study of Jewish Mysticism. Traditional Kabbalists regard it as originating in Tannaic times, redacting the Oral Torah, so do not make a sharp distinction between Kabbalah and early Rabbinic Jewish mysticism. Academic scholars regard it as a synthesis from the Middle Ages, when it appeared between the 13th and 15th centuries, but assimilating and incorporating into itself earlier forms of Jewish mysticism, possible continuations of ancient esoteric traditions, as well as medieval philosophical elements.