Visual regression testing is a quality assurance process used to detect unintended visual changes in a user interface after code updates. Automated tools capture screenshots of web pages or applications before and after changes, then compare them pixel by pixel to identify differences. This helps teams quickly spot layout issues, broken elements, or styling errors that may have been introduced during development. By automating this process, organizations can ensure consistent user experiences and reduce the risk of visual bugs reaching production. Visual regression testing is especially valuable in agile environments where frequent updates are made.