REST is an architecture style for sending messages back and forth from the client to the server over HTTP. The REST architectural style does not define any standard for querying and updating data. Open Data Protocol (OData) defines a web protocol for querying and updating data via RESTful web APIs uniformly. Many companies, including Microsoft, IBM, and SAP, support OData today, and it is governed by Organization for the Advancement of Structured Information Standards (OASIS). Currently, the latest release of OData is Version 4.0.