The document discusses testing activities in continuous integration and continuous delivery as an exploratory tester. It defines continuous integration and continuous delivery, noting that testing should be done continuously throughout the project lifecycle. It outlines testing activities like test strategy preparation, guiding development with behavior-driven development, exploratory testing including usability and regression testing, continuously reviewing and improving test suites, and testing in production-like environments. It emphasizes that exploratory testing focuses on learning unknowns through exploring requirements and the system, and that findings from exploratory testing can be used to identify areas for test automation or manual testing. Tools used in exploratory testing are also highlighted.