The menorah holds nine candles. Eight of these candles each symbolize one of the eight days of the celebration of Hanukkah, the Festival of Lights. The ninth holder, called the shamash is for a candle used to light all the other candles.
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The menorah in the Tabernacle had seven oil lamps (Exodus ch.25).
Our Hanukkah-menorahs have eight candle-holders for the eight days of Hanukkah, plus a place for the helper-candle which is used to light the others.
There are eight flames for the actual lighting, plus a "leader" candle which is used to light the others.