Why Microsoft kept Model in MVVM and MVC as different?

Its two different kind of patterns , used in software development MVVM : Model -View -ViewModel MVC : Model View Controller http://stackoverflow.com/questions/667781/what-is-the-difference-between-mvc-and-mvvm https://www.linkedin.com/pulse/difference-between-mvc-mvp-mvvm-swapneel-salunkhe https://www.linkedin.com/pulse/understanding-difference-between-mvc-mvp-mvvm-design-rishabh-software https://www.quora.com/What-are-the-main-differences-between-MVC-MVP-and-MVVM-design-patterns-for-the-JavaScript-developer http://www.infoworld.com/article/2926003/microsoft-net/exploring-the-mvc-mvp-and-mvvm-design-patterns.html Please Refer the above links which explains the actual differences between MVC & MVVM.