Jet and underlying event measurements in p+p collisions at RHIC

The physics of hadron-hadron collisions is very complex involving both perturbative and non-perturbative QCD. It is therefore imperative to study p-p collisions in as much detail as possible to provide a wide variety of data against which the various theoretical calculations can be tested. Direct jet measurements, for instance, help address fundamental questions of the fragmentation process. These measurements form a critical baseline for comparisons of results from heavy-ion studies, where modifications of the fragmentation functions are expected due to interactions of the high Q2 scattered partons with the hot and dense medium. Finally, it is also important to gain a deeper understanding of how the beam-beam remnants, multi-parton interactions and initial- and final-state radiation combine to produce the particles observed in the underlying event. In this talk we present results on jet production and the underlying event in p-p collisions at 200 GeV collisions as measured by the STAR experiment at RHIC.