Differnce between 'GATHER EMPTY' and 'BLAND GATHER'

Hey experts,.
What is the exact differnce between below 2 statements

1
dbms_stats.GATHER_SCHEMA_STATS( user , method_opt => 'FOR ALL COLUMNS SIZE AUTO', options => 'GATHER EMPTY' , degree => 4 ) ;
2nd
 dbms_stats.GATHER_SCHEMA_STATS( user , method_opt => 'FOR ALL COLUMNS SIZE AUTO', options => 'GATHER STALE' , degree => 4 ) ; 

Documentation for GATHER_SCHEMA_STATS :

+ STALE GROUPING: collects statistics on obsolete objects as determined by looking at the views of tabmodifications. Also, return the list of items found to be stale. +

GATHER EMPTY: Collects statistics on objects that currently have no statistics. In addition, return a list of objects found to have no statistics.

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