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It reduces the speed of nuetrons and hence control the chain reaction 

Answer

A moderator is a material used in a nuclear reactor to slow down the neutrons produced from fission. By slowing the neutrons down the probability of a neutron interacting with Uranium-235 nuclei is greatly increased thereby maintaining the chain reaction. Moderators are made from materials with light nuclei which do not absorb the neutrons but rather slow them down by a series of collisions. Carbon in the form of graphite is a material used for moderators as is heavy water which is Deuterium an isotope of Hydrogen with an atomic mass of 2 bonded to Oxygen.

The moderator only slows neutrons down in order to increase the interaction with Uranium nuclei. They do not give any protection if the reaction goes out of control. If a chain reaction is heading out of control the reactors needs to be able to reduce the concentration of neutrons. For this the reactor uses control rods. Control rods are made from material with the ability to absorb neutrons; Cadmium and Boron are examples of suitable materials. By inserting control rods between the fuel rods the chain reaction can be slowed down or shut down. Withdrawing the control rods can restart or speed up the reaction.

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reduces the speed of neutrons

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graphite rods acts as moderator to control the speed of neutrons striking the fuel

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In nuclear reactor graphite rods are used as moderator or controller.

Application of moderator is to slow down the newtron and controller is to control the number of neutron.

Answer

Graphite rods function as moderator or controller in nuclear reactor to control the rate of reaction.

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To slow down the extremely rapid motion of neutrons produced in the fission reaction. 

Answer
It is the controller. It absorbs excessive electrons produced.

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