Is there a difference between ocean animation and cube animation?

Is there a difference between ocean animation and cube animation?

I can animate a cube or object and make it move.

But when I start with modifier ocean and I choose the following steps

go to keyframe
make change
insert keyframe

for oceans it does not seem to work. I cant insert a keyframe, but it seems there are different types of frames, which one is used?

Ocean modifier simulate wave animation: