The candle at the left is the shamash, the servant candle which lights the others.
Tomorrow night there will be two candles and one shamash. Every night another candle is added and the light increases.
The chanukiya (menorah) is traditionally placed in a window or near the door or is lit outside in order to "publicize the miracle" to everyone.
Here is a photo from last year. This is how the chanukiya will look on the 8th and final day of the Festival of Lights.
Chag sameach--happy holiday!