Everything began in 1966 with the debut of the original Star Trek television series. Though it was canceled prematurely (due to a flawed ratings system), there has been one form of Trek on television basically ever since. 

SeriesSeasonsAir Dates
Star Trek31966-1969
Star Trek: Phase II  
Star Trek: The Next Generation71987-1994
Star Trek: Deep Space Nine71993-1999
Star Trek: Voyager71999-2001
Star Trek: Enterprise42001-2005
Star Trek: Discovery22017-
Star Trek: Short Treks22018-
Star Trek: Picard12020-
Star Trek: Strange New Worlds **2021-
Star Trek: Section 31 **2021-

* Currently Under Development