Protractor is an end-to-end test framework for AngularJS applications. Protractor is a Node.js program that supports the Jasmine and Mocha test frameworks.
Selenium is a browser automation framework. Selenium includes the Selenium Server, the WebDriver APIs, and the WebDriver browser drivers.
Protractor works in conjunction with Selenium to provide an automated test infrastructure that can simulate a user’s interaction with an Angular application running in a browser or mobile device.
