What can I imagine under cross-platform program is a legitimate question, and there is also a simple answer!
If a program or application is
cross-platform, it is called
platform independenceof the software. These programs have the ability to work on different operating systems.
platform independenceis often referred to as portability, this comes from the term porting. When porting when an application (software program) is made platform-independent is the process.
About platform independence on wikipedia:
... Platform independence is the property of a program on different computer systems with differences in architecture, processor, compiler, operating system and ... !
Cross-platform = platform independence
For example Firefox is a Cross-Platform Software for Linux, Android, MAC, Windows, Ubuntu ....
FAQ 11: Updated on: June 6th 2018 19:53