3D Animations

Hey guys, just a simple question,

Does the PROJECT: STEALTH go through how to animate a 3D model? I have animated 3D models in my games, but I have not build the model nor the 3D. I just add them to the Animator and code it.

Are the animations for say walking, attack etc built while the model is being created in say blender? Or are the animations built in Unity some how.

I don't mean dragging in the animations to the animator but creating the animations themselves.

Just a little confused on this. thanks guys hope this makes sense!