End-to-end (E2E) testing, also known as system testing or scenario testing, is a comprehensive software testing method that evaluates the functionality of an application in a real-world environment.

This type of testing focuses on testing the entire software application from start to finish, ensuring that all components work together seamlessly. E2E testing simulates real user scenarios, testing the application's functionality across multiple layers, from the user interface to the backend systems.

This testing approach helps identify any potential issues or bugs that may arise when different components interact with each other. One of the key benefits of E2E testing is its ability to uncover defects that may not be detected during unit testing or integration testing.

By testing the application as a whole, E2E testing helps ensure that all components work together as intended, providing a more accurate picture of the software's performance. E2E testing is typically performed using automated testing tools, which can help streamline the testing process and improve efficiency.

By automating the testing process, software development teams can quickly identify and address any issues, reducing the time and resources required for testing. Overall, E2E testing is a critical component of the software development process, helping to ensure the quality and reliability of the final product.

By thoroughly testing the application from end to end, software development teams can deliver a high-quality product that meets the needs and expectations of users.