  In the past two decades, the revolutionary technologies of creating cold and
ultracold molecules have provided cutting-edge experiments for studying the
fundamental phenomena of collision physics. To a large degree, the recent
explosion of interest in the molecular collisions has been sparked by dramatic
progress of experimental capabilities and theoretical methods, which permit
molecular collisions to be explored deep in the quantum mechanical limit.
Tremendous experimental advances in the field has already been achieved, and
the authors, from an experimental perspective, provide a review of these
studies for exploring the nature of molecular collisions occurring at
temperatures ranging from the Kelvin to the nanoKelvin regime, as well as for
applications of producing ultracold molecules.
