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JSON is an abbreviation for “JavaScript Object Notation”. It is a way to represent data using text and although it is derived from JavaScript it is supported by most of the major languages.
ASP.NET Core is a framework for building cloud based applications. It is open source, and cross platform. You can use it to build web applications and IoT apps as well as backends. You can use any of your favorite developer tools for Windows, Mac OS or Linux to deploy to either the cloud or on-premises.