Does Blender consider each frame to be separate scenes, while rendering animation? While rendering an animation in blender is each frame considered a different scene?

I don't have much experience with animations what I do know is that while creating a video several images are rendered (frames) and then combined at about 24FPS.  

My question is, are each of these frames considered a to be a different Scene?
I can only answer the first question.

Each frame is NOT considered a different scene. Every scene has their own frames/timeline.

So "Scene 1" could have 250 frames, and "Scene 2" could have 150 frames. However, the first 150 frames in each of these scenes are different. Changing some animation in frame 50 in "Scene 1" does not affect frame 50 in "Scene 2" (unless you've specifically linked them).

At the top of Blender, you can see which scene you currently reside in: