The significance of agile testing in software release cycles lies in its focus on iterative development and customer feedback. Agile testing practices enable continuous integration and rapid delivery of software increments. By incorporating testing early in the development process, issues can be identified and addressed promptly, thus enhancing software quality. Agile testing fosters collaboration among development and testing teams, leading to a more adaptive approach that meets changing requirements. This ultimately results in shorter release cycles and increased customer satisfaction through timely delivery of reliable products.