Protractor is an end-to-end testing framework, is an open source automation for Angular and AngularJS applications. It is designed by Google developers on the top of webdriverJS for node.js program. It tests your application running in a real world browser that interacts with its users. It extends webdriverJS functionalities on web applications to enable automation of useractions.

“End-to-End Testing” is a methodology which is used to test the flow of application from start to end or verify the use-cases and user scenario of the application.

“AngularJS” is an open-source framework to build for front-end applications for the web. It is a javascript based framework maintained by Google. It is referred to as Angular 1.

“Node.js” is an open source application to develop networking applications on the server-side. It is written in javascript and allows you to run on a server.

“WebdriverJS” is an implementation of selenium javascript binding for selenium webdriver API and interacts with browser elements. Protractor is a wrapper over WebdriverJS. It has more functionalities so it will handle angularJS elements.

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