The main branches, or movements, of Judaism today are Orthodox, Conservative, and Reform, with smaller streams such as Reconstructionist and Humanist Judaism. Orthodox Judaism treats traditional Jewish law (halakha) as binding, while Conservative and Reform Judaism adapt practice to modern life to differing degrees, with Reform the most liberal of the three.
In the United States, Pew Research Center’s survey of Jewish Americans found that 37% identify as Reform, 17% as Conservative, and 9% as Orthodox, while 32% do not identify with any denomination and 4% belong to smaller branches or several streams. Orthodox Judaism itself includes Modern Orthodox and Haredi (ultra-Orthodox) communities, among them Hasidic groups.
Source: Pew Research Center: Jewish Americans in 2020, Jewish identity and belief
Image: Torah ark of the Synagogue de Thann by Elyane ferrari, CC BY-SA 3.0, via Wikimedia Commons.