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Apple consider themselves special, so rather than just calling them what everybody else does and calls them Certificates or CA Certificates, they made their own name.
It is just a standard encrypted file that identifies the app and allows the connection to be made between your user account/device and the application developers servers. It is installed by default by most applications that have server client connections and without it, your applications such as email, web browser and anything else that has a connection back to a server would not be allowed to run.