Plug-ins or add-ons add functionality-such as audio effects or DVD capability-to Windows Media Player. Visualizations are colors, shapes, and patterns that move to the music in Windows Media Player Now Playing mode.
You can learn more about Windows 10 here. Note: Windows Essentials (Movie Maker, Windows Photo Gallery, and Windows Live Writer) reached end of support on January 10, 2017. They are no longer available for download.