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We introduce the main concepts and announce the main results in a theory of tensor products for module categories for a vertex operator algebra. This theory is being developed in a series of papers including hep-th 9309076 and hep-th 9309159. The theory applies in particular to any ``rational'' vertex operator algebra for which products of intertwining operators are known to be convergent in the appropriate regions, including the vertex operator algebras associated with the WZNW models, the minimal models and the moonshine module for the Monster. In this paper, we provide background and motivation; we present the main constructions and properties of the tensor product operation associated with a particular element of a suitable moduli space of spheres with punctures and local coordinates; we introduce the notion of ``vertex tensor category,'' analogous to the notion of tensor category but based on this moduli space; and we announce the results that the category of modules for a vertex operator algebra of the type mentioned above admits a natural vertex tensor category structure, and also that any vertex tensor category naturally produces a braided tensor category structure.