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Gatling is an open-source load testing tool designed for web applications. It allows users to simulate a large number of users accessing the application simultaneously, enabling performance testing and stress testing to ensure that the application can handle high loads. Gatling achieves this by utilizing an efficient, non-blocking architecture built on Akka and Scala, which allows for considerable scalability and performance. Its expressive DSL (Domain Specific Language) in Scala lets testers create complex scenarios while maintaining readability and ease of use.

One of the primary attractions of Gatling is its detailed and insightful reports generated after each test, which help teams identify performance bottlenecks and inefficiencies in their applications. Additionally, it integrates seamlessly into CI/CD pipelines, offering both REST and SOAP testing capabilities, making it a versatile choice for development teams adopting DevOps practices. Gatling also offers a commercial version called Gatling Enterprise, which provides advanced features like a user interface for scenario creation, enhanced reporting and analytics, and team collaboration tools. The open-source version remains highly popular due to its powerful features and active community support.