Software testing is a critical component of modern software development, aimed at identifying and addressing issues throughout the project lifecycle to ensure high-quality, secure, and user-friendly products. It encompasses both manual and automated methods to evaluate not just the codebase but the entire user experience, serving as the final quality control step before software deployment. Various types of testing, including functional and non-functional testing, address different aspects such as functionality, performance, security, usability, and compatibility across devices and environments. Functional testing focuses on whether software components meet specified requirements, while non-functional testing assesses usability, reliability, and performance under varying conditions. Additionally, black-box, white-box, and gray-box testing provide different levels of insight into the software's internal workings, enhancing the testing process. Automation plays a pivotal role in streamlining testing efforts, enabling teams to reduce costs and improve scalability, ensuring the software meets customer needs and withstands cyber threats efficiently.