Why does `ansi-color-names-vector' appear in my .emacs?

[Xue Fuqiao]

I found this expression in my .emacs:

  (custom-set-variables
  [...]
   '(ansi-color-names-vector
     ["#2d3743" "#ff4242" "#74af68" "#dbdb95" "#34cae2" "#008b8b"
"#00ede1" "#e1e1e0"])
  [...])

I don't know why this expression appears in my .emacs, I'm sure I have
never customized this variable directly.  I have searched it in the
manuals and web, but I still don't know what these colors are for and
how this expression was generated.  Can anyone point me in the right
direction?

--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/