What is realm

In the context of Kerberos, what is meant by the term realm?

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A full service Kerberos environment comprises of the Kerberos server, a number of clients, number of application server need the following:

a) The Kerberos server should have user ID and hashed the password of all participating users within its database.

b) The Kerberos server should share the secret key with every server. Such an environment is known as ‘Realm’. 

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