Cross-platform software refers to applications that can run on multiple operating systems or devices without needing significant modifications. This means that a program designed for Windows can also work on macOS or Linux, allowing users to access the same features and functionalities regardless of their device. The main advantage of cross-platform software is its flexibility and wider reach. Developers can create a single version of the software that caters to various platforms, saving time and resources. Popular examples include web browsers like Google Chrome and Mozilla Firefox, which are available on different operating systems.