what is zookeeper port and its usage?

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I am quite new for zookeeper port through which I am coming across from past few days.
I introduced with zookeeper port keyword at two occasion:

while configuring neo4j db cluster ( link ) and

while running compiled voltdb catalog ( link ) (See Network Configuration Arguments)

Then, I came across Apache Zookeeper , (which I guess is related to distributed application, I am a newbie in distributed application as well). hence question came in my mind:

is there any implementation of apache zookeeper in above 2 scenarios ?

What exactly this zookeeper port do internally ?

Any help would be appreciated, Thanks.

Zookeeper is used in distributed applications mainly for configuration management and high availability operations. Zookeeper does this by a Master-Slave architecture. Neo4j and VoltDb might be using zookeeper for this purpose

Coming to the ports understanding : suppose u have 3 servers for zookeepers ... You need to mention in configuration as

clientPort=2181
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888
server.3=zookeeper3:2888:3888
Out of these one server will be the master and rest all will be slaves.If any server goes OFF then zookeeper elects leader automatically .
  Servers listen on three ports: 2181 for client connections; 2888 for
  follower connections, if they are the leader; and 3888 for other
  server connections during the leader election phase .
                as per your this line server.1=zookeeper1:2888:3888 is concern, did you mean that hostname is zookeeper ? because above configuration is present in neo4j coord.cfg file..
                    – agpt
                Aug 12 '13 at 12:13
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