OData (Open Data Protocol) is an ISO/IEC approved, OASIS standard that defines a set of best practices for building and consuming RESTful APIs. OData helps you focus on your business logic while building RESTful APIs without having to worry about the various approaches to define request and response headers, status codes, HTTP methods, URL conventions, media types, payload formats, query options, etc. OData also provides guidance for tracking changes, defining functions/actions for reusable procedures, and sending asynchronous/batch requests.
OData RESTful APIs are easy to consume. The OData metadata, a machine-readable description of the data model of the APIs, enables the creation of powerful generic client proxies and tools.
OData v4 is standardized by OASIS, including Protocol Specification, URL Conversions, Common Schema Definition Language, JSON Format Specification, ABNF, Standardized Vocabularies, and Aggregation Extension. OData v4 can also be ordered from ISO/IEC as ISO/IEC 20802-1:2016 (OData 4.0 Protocol) and ISO/IEC 20802-2:2016 (OData 4.0 JSON Format)