Why is there a subkey and a selfsig in a new key?

Adam adam_w67 at yahoo.com
Tue Nov 8 13:15:47 CET 2011

when creating a new key, gpg2 creates a selfsig and a subkey which is
selfsiged as well.  Why does it do so?  Why not create just a plain key
without subkey and selfsig?

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