When creating a profile using manageprofiles.sh (Linux) or manageprofiles.bat (Windows), if the -enableAdminSecurity option was not used, administrative security will be disabled. When administrative security is disabled, the realm name field will be empty.
When configuring a user account repository, you will establish the realm name. In this example, defaultRealm is used as the realm name.
Realm name is used when configuring single sign-on (SSO) between two or more WebSphere servers. SSO requires each WebSphere server to have the same realm name.