it is loaded by expl3.sty on which xparse is based.

The reason is mentioned in 

texdoc expl3

/Lars Madsen
Institut for Matematik / Department of Mathematics
Aarhus Universitet / Aarhus University
Mere info: / More information:

From: Mailing list for the LaTeX3 project [[log in to unmask]] on behalf of Alexander Grahn [[log in to unmask]]
Sent: 17 October 2013 16:19
To: [log in to unmask]
Subject: xparse loads graphics

Consider the following example:


  \typeout{Package `graphics' was loaded.}

Why das xparse load graphics? What is it used for?

Dr.-Ing. Alexander Grahn
Helmholtz-Zentrum Dresden-Rossendorf e. V.
Institut für Ressourcenökologie
PF 51 01 19
01314 Dresden

m a i l t o : A . G r a h n @ h z d r . d e
Tel.: +49 (0)3 51-2 60 23 31
Fax.: +49 (0)3 51-2 60 12 33 1