Trekkie is a fan of
the old series. They might like
TNG,
DS9, or
Voyager, but they started as
TOS fans and usually still like that best. I believe the name comes from the
hippie-like
utopian Star Trek universe.
Trekkie sounds similarish to
hippie.
Trekkers like TNG, DS9, and/or Voyager best, or at least became Trek fans from watching them.
I'm a Trekker because I like DS9 best and because DS9 was what first got me into Trek. Most Trekkies are older than your average Trekker, 'cause they were around when TOS was on TV.