Wolfram Player (was Mathematica Player) is an innovative new take on viewer applications. Rather than just a reader, like Acrobat Reader, or a thin runtime, like Flash Player, Wolfram Player has the full Mathematica engine embedded right there-ready to make documents come alive or to power applets. (Of course, don't forget it can read notebooks too!)
CDF Player includes all the great functionality you've come to expect from Wolfram Player including full support for .nb and .nbp files-plus new interactivity and deployment options.
Updated on Feb 28 2022