In professional wrestling, the independent circuit (often shortened to the indie circuit or the indies) is the collective name of independently owned promotions which are deemed to be smaller and more regionalized than major national promotions.
Independent promotions are essentially viewed as a minor league or farm system for the larger national promotions, as wrestlers in "indie" companies (especially young wrestlers just starting their careers) are usually honing their craft with the goal of being noticed and signed by a major promotion.
It is also not uncommon for veteran wrestlers who have had past tenures with major promotions to appear on independent shows, either as special attractions or as a way to prolong their careers.