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Portable software is a software program that can be run on different computers running different operating systems with no or little modifications.
The Latin word “port” means to carry. Portability is the attribute of being easy to carry from one point to another or, in this case, from one operating system to another.
Typically, software is said to be portable when it is more cost efficient to exchange it between two different platforms than to write the program from scratch. Emulators are used to give more application extensibility to the software package, which allows it to run on multiple operating systems.