Automated testing is the application of software tools to automate a human-driven manual process of reviewing and validating a software product. Most modern agile and DevOps software projects now include automated testing from inception.
Automated testing has transformed modern software development. Arguably, is a major enabler for the explosion of apps over the past decade. Before test automation, all tests had to be done manually. This was slow, error-prone, and expensive. As a result, it often led to QA teams being seen as a blocker to releasing software
What is automated testing?
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Automated testing refers to any approach that makes it possible to run your tests without human intervention. Traditional testing has been done manually. A human follows a set of steps to check whether things are behaving as expected. By contrast, an automated test is created once and then can run any time you need it.

For a long time, developers have automated their unit testing. That is, the tests that check whether a given function is working properly. Then automated testing frameworks like Selenium were developed. These allow modules or entire applications to be tested automatically.

These frameworks allow a test script to interact with your UI, replicating the actions of a user. For instance, they allow you to find a specific button and click it. Or locate a text entry box and fill it out correctly. They also allow you to verify that the test has completed correctly.

As a result, automation testing reduces the time and effort needed for extensive and repetitive testing tasks.
There are two different ways to test an application: automated and manual. Read on to learn about each method, some common testing misconceptions, and how to get started with test automation.  

What is Automation Testing?
Automated testing is the implementation of an automation tool to execute test cases.  

This is well-suited for projects that are large or require testing to be repeated multiple times. It also could be applied to projects that already have been through an initial manual testing process.  

By employing automation, the tester can spend more time on high-value tasks. While this does require the tester to maintain test scripts, it ultimately will help increase application quality, test coverage, and scalability.  

Automated Testing means using special software for tasks that people usually do when checking and testing a software product. Nowadays, many software projects use automation testing from start to end, especially in agile and DevOps methods. This means the engineering team runs tests automatically with the help of software tools. It will help to keep the testing team to make the process faster. Continuous delivery (CD) and quickly sends the new code to users. Automated testing is important for this because it converts the manual steps into automation. 
Automated testing is important for this because it converts the manual steps into automation. Continuous integration (CI) checks the new code changes to prevent issues. CD gets after CI done everything well. Automated testing, CI & CD will together prove that the new code is error-free and ready for deployment quickly for the project purpose.