1. A computer-implemented method of searching for a plurality of documents residing on a network, comprising: receiving a search request from a user, comprising one or more search terms, wherein the one or more search terms are included in an ontology, and wherein the ontology includes a plurality of terms, and one or more of the plurality of terms includes a plurality of sub-category terms; identifying one or more documents residing on the network based on the one or more search terms and an ontology index, wherein the ontology index comprises a plurality of relationships between the plurality of terms or sub-category terms of the ontology and a plurality of documents residing on the network; and presenting one or more search results that describe the one or more documents to the user, wherein the one or more documents contain the one or more search terms, or one of the plurality of sub-category terms of the one or more search terms.