Protractor runs the tests against the web application by running it in real web browsers. It also interacts with the application like an end-user would, e.g. clicking buttons, links, filling forms, etc., and verifying the result with the expected outcome.
Since Protractor is based on the Selenium WebDriver, it’s easy to perform cross-browser testing. It provides a simple API compared to Selenium, so the learning curve is not too steep. Developers can quickly get familiar with it and start writing the end-to-end UI tests. You can also take snapshots and compare them using Protractor. It also allows you to run parallel test cases on different machines.
