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Kuiper Belt Objects, or more generally Trans-Neptunian Objects (TNOs), areplanetesimals found beyond the orbit of Neptune. Some TNOs evolve ontoNeptune-crossing orbits and become Centaurs. Many Centaurs, in turn, reachJupiter-crossing orbits and become Jupiter-family comets (JFCs). TNOs are themain source of the JFCs. TNOs offer a different window than the JFCs, of moreprimordial bodies and over a different size and temperature range. It is inthat context that this chapter is written. Here we discuss the dynamicalpathways taken from the trans-Neptunian region to the JFCs, and the mostimportant properties of TNOs that relate to the JFC population, includingconsiderations of their origins, compositions, morphologies, and sizedistributions. We relate these properties to the JFCs whenever possible. Wereflect on a few key outstanding issues regarding our incomplete knowledge ofTNOs as they pertain to the Centaurs and JFC populations. We finish with ashort discussion of notable new and upcoming facilities and the impacts theywill have regarding these outstanding questions.

The Transition from the Kuiper Belt to the Jupiter-Family (Comets)