cluster is a group of network.

cluster means its a just name which is used to generate the VSAM files by using the JCL utility IDCAMS.
for ex://sysin dd*
define cluster
name
data
key

All VSAM datasets created in the form of cluster,cluster contain name component,data componant,index component,esds,lds,rrds contains name and data coponants but ksds contains name,data,index componants

cluster is a collection of
Data component,
Index component..

Clusters are sets of collaborating computer systems that are usually used to guarantee high availability of services

Cluster is logical thought of dataset . it consist two seperate physical datasets..
1)data component,, it consist actual data..
2)Index component.. it consist actual index.. like access key and it's pointer in the data component

CLUSTER MEANS= INDEX COMPONENT+DATA COMPONENT
A VSAM cluster is a logical definition for a VSAM data set and has one or two components:

The data component of a VSAM cluster contains the data records.
The index component of a VSAM key-sequenced cluster consists of the index records.

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