  The e+e- linear collider physics programme sets highly demanding requirements
on the accurate determination of charged particle trajectories close to their
production point. A new generation of Vertex Trackers, based on different
technologies of high resolution silicon sensors, is being developed to provide
the needed performances. These developments are based on the experience with
the LEP/SLC vertex detectors and on the results of the R&D programs for the LHC
trackers and also define a further program of R&D specific to the linear
collider applications. In this paper the present status of the conceptual
tracker design, silicon detector R&D and physics studies is discussed.
