For proper data management, every item should be uniquely identified. Globally Unique Identifiers (GUIDs) offer a truly unique identification method for each feature or table row. In the ArcGIS world, GUID values are commonly interacted with as Global IDs. The term “Global ID” is the official name for GUID values that are generated and managed by ArcGIS software. Is this Global ID value something we take for granted because it is so easily managed in ArcGIS? Maybe. If that is the case, this short read will lessen that chance and at minimum increase and/or refresh your understanding of how they work.