What is cross-platform in software?

Cross Platform means, it is supported by multiple platforms . Example: A particular software which is capable of running in Windows, Android, iOS, UNIX, LINUX etc are called Cross platform support. If need an application developed in Macintosh to be run on Windows then the relevant Python interpreter is required.

Python is a cross-platform language: a Python program written on a Macintosh computer will run on a Linux system and vice versa . Python programs can run on a Windows computer, as long as the Windows machine has the Python interpreter installed (most other operating systems come with Python pre-installed).