This is a multi-meaning term that usually means software that encases resources, appends code or other software for the purposes of improving user convenience, hardware or software compatibility. In programming, a wrapper is a program, logical code or script that prefaces and initiates the running of another, more important program or main program. In essence, it establishes a small number of rules that allows data to be transported without loss of fidelity from one computing platform to another. The notion of making data portable in this way is called Platform Independent Data. In terms of plug-ins, the wrapper acts as a translator from one API (Applications Programming Interface) to another.