Hadrons are the composite particles built up from quarks and gluons. Their interaction is
described by Quantum Chromo Dynamics, the theory of the strong force. The most
famous example of hadrons are protons and neutrons which constitute the building blocks
of the matter of which we and our universe are composed. Despite long investigation we
still remain far from understanding the intricacies and mysteries of their inner structure
and how the spectrum and structure of hadrons emerge from the forces among their
Jefferson Laboratory's primary mission is to expand our knowledge of the universe by
studying the emergence of hadrons and their interactions from the properties and
dynamics of quarks and gluons in Quantum Chromo Dynamics.
In this talk some open problems in hadron physics, addressed by the Jefferson Lab
scientific program, will be presented.