Animation in Blender or Unity?

As far as it goes, I'm a noob to both programs really, but I've made my own object and gave it a texture, now before I animate it in blender, I'm curious - do I animate a walk cycle in blender or unity?

I have worked in unity 2D and for that project you uploaded images to the animator. I was just wondering if I had to animate in 3D in unity too? How does it work if I animate it in blender? Would I save an animation and upload it to unity in a model?

Is there a tutorial for this? Haha! Excuse my silly questions. Help is appreciated :)