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This was historically challenged by the Karaites, a movement that flourished in the medieval period, retains several thousand followers today and maintains that only the Written Torah was revealed. In modern times, liberal movements such as Humanistic Judaism may be nontheistic.
Orthodox Judaism maintains that the Torah and Jewish law are divine in origin, eternal and unalterable, and that they should be strictly followed. Conservative and Reform Judaism are more liberal, with Conservative Judaism generally promoting a more "traditional" interpretation of Judaism's requirements than Reform Judaism. A typical Reform position is that Jewish law should be viewed as a set of general guidelines rather than as a set of restrictions and obligations whose observance is required of all Jews.
Historically, special courts enforced Jewish law; today, these courts still exist but the practice of Judaism is mostly voluntary. Authority on theological and legal matters is not vested in any one person or organization, but in the sacred texts and the many rabbis and scholars who interpret these texts.
Rabbinic literature, in its broadest sense, can mean the entire spectrum of rabbinic writings throughout Jewish history. But the term often refers specifically to literature from the Talmudic era, as opposed to medieval and modern rabbinic writing, and thus corresponds with the Hebrew term Sifrut Hazal (ספרות חז"ל; "Literature [of our] sages [of] blessed memory," where Hazal normally refers only to the sages of the Talmudic era). This more specific sense of "Rabbinic literature"—referring to the Talmudim, Midrash, and related writings, but hardly ever to later texts—is how the term is generally intended when used in contemporary academic writing. On the other hand, the terms meforshim and parshanim (commentaries/commentators) almost always refer to later, post-Talmudic writers of Rabbinic glosses on Biblical and Talmudic texts.
The Mishnah and the Tosefta (compiled from materials pre-dating the year 200) are the earliest extant works of rabbinic literature, expounding and developing Judaism's Oral Law, as well as ethical teachings. Following these came the two Talmuds:
Midrash (pl. Midrashim) is a Hebrew word referring to a method of reading details into, or out of, a Biblical text. The term midrash also can refer to a compilation of Midrashic teachings, in the form of legal, exegetical, homiletical, or narrative writing, often configured as a commentary on the Bible or Mishnah. There are a large number of "classical" Midrashic works spanning a period from Mishnaic to Geonic times, often showing evidence of having been worked and reworked from earlier materials, and frequently coming to us in multiple variants.
Meforshim is a Hebrew word meaning "(classical rabbinical) commentators" (or roughly meaning "exegetes"), and is used as a substitute for the correct word perushim which means "commentaries". In Judaism this term refers to commentaries on the Torah (five books of Moses), Tanakh, the Mishnah, the Talmud, responsa, even the siddur (Jewish prayerbook), and more.
Classical Talmudic commentaries were written by Rashi. After Rashi the Tosafot were written, which was an omnibus commentary on the Talmud by the disciples and descendants of Rashi; this commentary was based on discussions done in the rabbinic academies of Germany and France.