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HI, i have a circuit  in the image above this is a simple led circuit but i found a resistor between positive and negetive terminal  the resistor's value is 15 kilo ohms but i don't know what it does in this circuit can anybody tell me ( Elaborate! ).
regards

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The resistor should be in SERIES with the LED... not in parallel. Also, are you sure the resistor is 15K? That is very high resistance. 1.5K is more likely. A very high value indicates the LED is connected to a VERY high voltage in order to get 20milliamps or so through the LED. The color code for 15k is BROWN-GREEN-ORANGE.... and the code for 1.5K is BROWN-GREEN-RED. If the resistor is as described in your question, it makes no sense to me.

Does the resistor reduce the voltage of the whole circuit in this case?

No it will not. His diagram shows all 3 components connected in PARALLEL. Therefore the battery is delivering full voltage and full amperes to both components, the resistor and the LED. In order for the resistor to lower the voltage to the LED, the 3 components must be connected in SERIES, .................... like this:
plusBATT---------RESISTOR-----------+LED-------minusBATTERY.