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Web Sockets are a bidirectional real-time client-server communication technology part of the HTML5 specification, superior to Ajax in terms of performance and simplicity.

Web Sockets are typically used in applications where real time updates are required .

Web browser Java Script frameworks, such as Angular JS, Ember.js, Ext JS, Knockout.js, Meteor.js, React and have adopted SPA principles.In some ways, the server simulates a web browser, receiving events and performing delta changes in server state which are automatically propagated to client.This approach needs more server memory and server processing, but the advantage is a simplified development model because a) the application is usually fully coded in the server, and b) data and UI state in the server are shared in the same memory space with no need for custom client/server communication bridges. The client page sends data representing its current state to the server, usually through Ajax requests.Using this data, the server is able to reconstruct the client state of the part of the page which needs to be modified and can generate the necessary data or code (for instance, as JSON or Java Script), which is returned to the client to bring it to a new state, usually modifying the page DOM tree according to the client action which motivated the request.This approach requires that more data be sent to the server and may require more computational resources per request to partially or fully reconstruct the client page state in the server.

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Web Sockets also enables us to multiplex data on the same connection, thus one can easily implement an 'AJAX library on top of Web Sockets' and still use the same Web Socket connection for bi-directional real-time data transfer.

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