This document introduces Cypress, an open-source test runner for front-end applications. It is described as fast, easy to use, and reliable for testing anything that runs in a browser. Key benefits highlighted include being fast, open source, working on any front-end framework, being friendly for developers and QA engineers using JavaScript, and having features like time travel and real-time reloading. The document also provides instructions on installing Cypress and running tests using its GUI runner or headless mode.