What is a JSON feed?
A widely used application of JSON is in mobile apps. Communication between the mobile device and the web server comes about by means of JSON calls. Data communication via JSON is such a popular method for mobile applications because the JSON data is so lightweight and can therefore be sent quickly and efficiently through a mobile connection.
Another commonly used application of JSON is in websites. JSON allows just parts of the web page, and not the entire page, to be refreshed and updated. This means the web browser can refresh a fragment of the web page with very little effort, giving the visitor a smooth online user experience.