What is an ontology? As a geoscientist/researcher/data manager what can Semantic Technologies do for me? This tutorial and introductory session takes attendees through the process of defining what an ontology is, where to find them, and what the collection of Semantic Technologies can do for the geosciences. We will explore what tools and semantic models are currently available, where to find them, and what one might do with them once they're found. Examples of existing and diverse geoscience sematic applications will be presented and demoed. We will also explore new application and collaboration areas within ESIP as well as explore potential limitations of such technologies.