This tool is used for the Software Update feature and its instance holds the talend-updates repository where the updates are retrieved by the user.
It can also be used as a catalog for the Jobs created from Talend Studio or any other Java IDE. For this, two repositories are available: repo-snapshot for development purposes and repo-release for production purposes.
So when unzipping Talend Administration Center zip file, you will find two archive files. One is called Artifact-Repository-Nexus-VA.B.C.D.E containing scripts to configure Nexus. The other is called Artifact-Repository-Artifactory containing Talend scripts to initialize the Artifactory repository.
Nexus is based on Sonatype Nexus. You need to install Nexus and to configure it with the initialization file in Artifact-Repository-Nexus-VA.B.C.D.E or to configure it manually. For more information on how to use it, see Sonatype Nexus documentation on http://www.sonatype.org/nexus.
For more information on how to use the Artifactory repository, see https://jfrog.com/artifactory/.
For more information on how to configure Talend Artifact Repository in Talend Runtime , see Configuring Talend Artifact Repository in Talend Runtime.