Cross-platform development refers to the practice of creating software applications that can run on multiple operating systems or platforms. This involves using technologies and frameworks that allow developers to write code once and deploy it across various platforms without needing to rewrite it for each one. Cross-platform development is often used in the creation of mobile apps, web applications, and desktop software. It can help save time and resources by allowing developers to reach a wider audience with a single code base. Common tools and frameworks used in cross-platform development include React Native, Xamarin, Flutter, and Apache Cordova. Overall, cross-platform development offers a convenient and efficient way for developers to create applications that can be used on different devices and operating systems.