Jest is a popular JavaScript testing framework that is well-regarded for its simplicity and flexibility. Coursera's Jest catalogue teaches you about the principles and practices of testing JavaScript applications using this powerful tool. You'll learn key concepts including unit testing, mocking, assertion, and test-driven development, as well as advanced testing techniques for asynchronous code and user interface components. Equip yourself with the skills necessary to ensure code reliability and quality, and become a proficient software engineer with mastery in Jest for robust application development.