PO is a text-based developer file that stores various data depending on used development environment or operating system. PO files are used for remote procedure calls, and are easy to maintain and adapt to user’s needs.

PO files can hold useful information while developing software with, for example, Java. PO as ans object file can be treated as a variable, function, or method, a feature very useful in distributed programming. PO files can be edited using any text editor.