The blessing of God for his commandment to kindle the lights of Hanukkah, the remembrance of the miracles performed for the ancestors, and the thanksgiving to God for his sustenance are the three Hanukkah blessings. Commemorators recite the first two blessings every night, but they recite the third blessing only on the first night of Hanukkah.
In the first blessing, the commemorators bless the Lord God for sanctifying the people with his commandments and for commanding them to put on the lights of Hanukkah.
The people also say the second blessing before the Megillah reading on Purim as well as at Hanukkah. This blessing praises the sovereign God for the wondrous deeds he performed for the ancestors at such a season in the days of old.
Commemorators recite the third blessing when lighting the Hanukkah menorah for the first time. The blessing reminds the people to appreciate the goodness of God in their lives and for sustaining them until the time of Hanukkah.
The blessings are part of the candle lighting ceremony, whereby family members gather around their menorahs and recite them. The number of candles lit each night corresponds to the night of the celebration. All three blessings begin with an exaltation portion referencing God as the ruler of the universe before specifying reason for the adoration.