Automated testing is the application of software tools to automate the manual process of reviewing and validating a software product. Most modern agile and DevOps software projects now include automated testing from the start of the project. To fully appreciate the value of automated testing, however, it helps to understand what life was like before it was widely adopted.
Most importantly, automation benefits product development by making it more efficient and continuous.

When software, an app, or another product can be designed and produced more efficiently, it frees up time and resources for continuous development after launch.
This means that businesses can work on more software and products with the same amount of team members.
Not only does this lead to better, more polished products, but it also means that businesses can stay ahead of the curve and keep their products relevant in a rapidly changing market.