Continuous integration (CI) in software development is significant as it promotes the practice of frequently merging code changes into a shared repository. This approach facilitates instant feedback on code quality through automated testing and builds, enabling developers to identify and rectify issues early in the development process. CI reduces integration problems and fosters collaboration among team members, ensuring that software is always in a deployable state. It promotes a culture of agility and efficiency, accelerating release cycles and enhancing overall product quality.