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Setting up Selenium Grid lets you run Selenium automation testing for any combination of browsers, their versions, and operating systems. You can test different browsers like Chrome, Firefox, Microsoft Edge, Safari, etc. It is platform-independent. Therefore a source code written for Linux would work smoothly on other operating systems like Windows, macOS, etc.
The key advantage of Selenium Grid is you can run parallel tests and cut down your test execution time for software releases
Selenium grid consists of two components:
Hub : This is the center of the Selenium Grid architecture that manages the network of test machines. In a network, only one hub is assigned to a test of DesiredCapabilities(operating system, browser version), and that hub finds the test matching the given configuration. Selenium Hubs are also known as servers.
Node : The Selenium nodes execute the tests previously loaded on the hub. There can be multiple nodes configured with different operating systems and browsers. The node does not need to run on the same platform as the hub. In the Selenium Grid, the nodes are the clients connected to the hub or server.
Shown below is the diagrammatic representation of the Selenium Grid.
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