Unit testing is a software development practice where individual components or functions of a program are tested in isolation from the rest of the system. The goal is to ensure that each unit of code performs as expected, making it easier to identify and fix bugs early in the development process. In cybersecurity, unit testing is crucial for verifying the reliability and security of code, as vulnerabilities can often be introduced at the function or component level. Automated unit tests are commonly used to streamline this process, providing quick feedback to developers and maintaining code quality throughout the software lifecycle.