Independent tour is an unescorted Tour sold through agents to individuals.
For one price, the client receives air travel, accommodation, Attraction admissions and typically, car rental.
Other definition:
Independent tour is a travel package in which a tour operator is involved only with
the planning, marketing, and selling of the package, but is not involved with the
passengers while the tour is in progress. See also frequent independent travel
(F.I.T.)
The Travel-Glossary: Everything about Travelling, Sightseeing and the World.