Entertainment tapes were a genre-specific type of tape used during the 23rd century that contained recreational programs.
In 2266, Captain Kirk offered the crew of the Antares use of the USS Enterprise's entertainment tapes, but Ramart, the Antares's captain, refused. Captain Kirk was initially confused at this, but it was later learned that Ramart was attempting to make a hasty departure from Charlie Evans, a young man whom they had transferred to the Enterprise and who had dangerous psychokinetic powers. (TOS: "Charlie X")