It is highly likely that a large organization has a big and complex testing environment: a wide variety of web applications being tested and many scenarios involving different OSes and browsers. Selenium Grid provides an easy way to distribute tests across multiple nodes supporting many testing scenarios:

• Scripts can request a specific OS and browser for the test.
• The Selenium Grid Hub will route the execution of the script to the appropriate Selenium instance.
• We can have many instances of Selenium running on different combinations of OSes and browsers.

Some of the advantages of using the Selenium Grid include the following:

• Since the tests run in a distributed environment, they can be executed in parallel, reducing costs and increasing speed.
• It allows the reuse of the existing architecture of the organization.
• Its distributed features work on physical or virtual nodes.