what does this query do:

SELECT 
   a.constraint_name AS fk_constraint_name, 
   a.table_name AS referencing_table, 
   a.column_name AS referencing_column, 
   b.constraint_name AS pk_constraint_name, 
   b.table_name AS referenced_table 
FROM all_constraints a 
JOIN all_constraints b ON a.r_constraint_name = b.constraint_name WHERE a.constraint_type = 'F' AND b.constraint_type = 'P' 
AND b.table_name = 'YOUR_TABLE' 
AND b.constraint_name = 'YOUR_PK_CONSTRAINT_NAME';