The Solenoidal Tracker At RHIC (STAR) will search for signatures of quarkgluon plasma (QGP) formation and investigate the behavior of strongly interacting matter at high energy density. The emphasis will be the correlation of many observables on an event-by-event basis. In the absence of definitive signatures for the QGP, it is imperative that such correlations be used to identify special events and possible signatures. This requires a flexible detection system that can simultaneously measure many experimental observables. This document will present the conceptual design and detector concept of the STAR experiment.