Automation testing tools are software applications used to automate the execution of tests, allowing for the rapid and efficient validation of software functionality. These tools help in reducing the time and effort required for manual testing, and they are commonly used in agile and DevOps environments to ensure the quality and reliability of software products.

Some popular automation testing tool include:

Selenium: An open-source tool used for automating web browsers. It provides a range of testing functions and supports multiple programming languages.

Appium: An open-source tool for automating mobile applications on iOS and Android platforms. It allows for testing of native, hybrid, and mobile web apps.

JUnit: A popular testing framework for Java programming language. It is used for writing and running repeatable automated tests.

TestComplete: A commercial automation tool that supports a wide range of application types, including web, desktop, and mobile applications.

Cucumber: A tool for behavior-driven development (BDD) that allows for the creation of automated acceptance tests.

Ranorex: A commercial automation tool for testing desktop, web, and mobile applications. It provides a user-friendly interface for creating automated tests.

These tools offer various features such as record and playback, scripting, integration with continuous integration tools, and reporting capabilities. The choice of automation testing tool depends on the specific requirements of the project, the technology stack, and the expertise of the testing team.