Is Enlightenment a full DE or just a WM?

I installed Enlightenment on my Linux Mint 17.2 Cinnamon. I thought it was just a Window Manager that I could switch to and use within Cinnamon. However, I found that I had to log out to my display manager and log in to Enlightenment. It presented me with what appeared to be a complete Desktop Environment. This brings me to the question: is Enlightenment a complete Desktop Environment or just a Windows Manager? Also, is it possible for me to use it to replace Muffin within Cinnamon? I doubt this is possible if Enlightenment is a complete DE.