In Jewish law and history, Acharonim are the leading rabbis and poskim living from roughly the 16th century to the present, and more specifically since the writing of the Shulchan Aruch in 1563 CE.
Yosef Karo
Isaac Aboab da Fonseca
Shneur Zalman of Liadi
Naftali Zvi Yehuda Berlin
Halakha, also transliterated as halacha, halakhah, and halocho, is the collective body of Jewish religious laws that are derived from the Written and Oral Torah. Halakha is based on biblical commandments (mitzvot), subsequent Talmudic and rabbinic laws, and the customs and traditions which were compiled in the many books such as the Shulchan Aruch. Halakha is often translated as "Jewish law", although a more literal translation of it might be "the way to behave" or "the way of walking". The word is derived from the root which means "to behave". Halakha not only guides religious practices and beliefs, it also guides numerous aspects of day-to-day life.
A full set of the Babylonian Talmud
Sefer Torah at Glockengasse Synagogue (museum exhibits), Cologne
Hasidim walk to the synagogue, Rehovot, Israel.
A mixed-gender, egalitarian Conservative service at Robinson's Arch, Western Wall