Wikipedia
In Judaism, a berakhah, bracha, brokho, brokhe (; pl. בְּרָכוֹת, berakhot, brokhoys; "benediction," "blessing," "drawing down [of spiritual energy]") is a formula of blessing or thanksgiving, recited in public or private, usually before the performance of a commandment, or the enjoyment of food or fragrance, and in praise on various occasions.
The function of a berakhah is to acknowledge God as the source of all blessing. Berakhot also have an educational function to transform a variety of everyday actions and occurrences into religious experiences designed to increase awareness of God at all times. For this purpose, the Talmudic sage, Rabbi Meir, stated that it was the duty of every Jew to recite one hundred berakhot every day (Men. 43b).
The Mishnah of tractate Berakhot, and the gemara in both Talmuds contain detailed rabbinical discussions of berakhot, upon which the laws and practice of reciting blessings are founded.
Berakhot typically start with the words "Blessed are You, Lord our God..."
One who hears another recite a berakhah answers with amen; but one who is engaged in prayer may at certain points be forbidden from other speech, including responding amen. With few exceptions, one does not respond amen to his or her own berakha, although other prayers—such as the kaddish—include " amen" in their text.