Where are the objects in the scene view stored?

I may add many objects into the scene but they don’t appear in any folder but they’re somehow saved. So, where are they saved?

Not sure if i understood the question correctly but in general:

In the scene file. There is a file with your scenename and the ending “.unity”. This is a file that you can open with a text-editor. Inside you can see all information that unity needs to load the scene in that state that you defined/saved it in.