Understanding find -depth

I was looking at a code and stumbled over the option -depth of find command

After searching what -depth does I found the below:

 -depth Process each directory's contents before the directory itself. 

Does it mean the sub directories are processed before the current directory in the search operation ?

Please help in understanding

Thanks

Check out the wikipedia article tree traversal and look for generic tree and note the difference between depth-first and breadth-first searches.