Hanukkah lasts a total of 8 days, and on each evening one lights an extra candle so by the end of the holiday the menorah should have 8 flames.
In the original history, the Jewish liberators of Jerusalem rededicated the Holy Temple that had been desecrated with Greek pagan practices. The process for this needed to last a week, but there was only one day’s worth of oil pure enough for the Holy Temple, and miraculously it burnt for 8 days, the time needed for new oil to be produced.
Now Jews around the world light a Hanukkah menorah, an 8-branched Jewish candle holder. The Hanukkah candle’s meaning is to remember the miracle that happened to allow the Holy Temple to be redacted for Jewish temple service.