CJ(all numbers behind it i.e. CJ2a CJ5, CJ7, CJ8, etc.)beginning of Jeeps through 1986(not officially wrangler because they were produced in canada where a car was already called wrangler)
YJ 1987-1995 first official wrangler(produced state side), square headlights, (i forget what year, but during YJ production it was changed from sports style roll bar to family style roll bar)
1996-No Jeep Wranglers were produced
TJ/LJ 1997-2006 back to round headlights, first fully coil spring Jeep, first model that Rubicon package was offered, first airbags in Wranglers) (LJ=longer wheel base TJ 04-06)
JK 07-present. first Wrangler offered with 4 doors or 2 doors, all plastic fenders, power windows, electronic sway bar disco, etc.
throw DJ in there somewhere and you've got the Wrangler mix.