The article by Nazneen Ahmad discusses the critical role of software testing in the Software Development Life Cycle (SDLC), emphasizing its importance in identifying bugs and ensuring software applications function as intended. Software testing is essential to maintain quality, reduce errors, and enhance security, ultimately saving organizations from significant financial losses due to software defects. Various types of testing, including functional, non-functional, manual, and automated testing, each serve distinct purposes, such as unit testing, regression testing, performance testing, and usability testing, among others. The article highlights the importance of early and continuous testing throughout the SDLC to detect defects early and improve product quality. It also discusses the principles and methodologies that guide effective software testing, stressing the need for a comprehensive approach that includes both manual and automated testing to enhance efficiency and reliability. Additionally, the article covers the significance of various testing strategies like regression, security, and compatibility testing, and provides insights into different testing methodologies and tools used to ensure a robust testing process.