What is the num_buckets and density in the following script?

What is the num_buckets and density in the following script?
I search the Oracle Doscs and find the descriptions, but I don't think it states clearly. Could you clarify it for me?
DENSITY :      NUMBER           Density of the column
NUM_BUCKETS :      NUMBER           Number of buckets in histogram for the column
SQL> SELECT column_name, num_distinct, num_buckets, density, histogram
  2  FROM USER_TAB_COL_STATISTICS
  3  WHERE table_name = 'JOBS' AND COLUMN_NAME='MAX_SALARY';
COLUMN_NAME                    NUM_DISTINCT NUM_BUCKETS    DENSITY HISTOGRAM
MAX_SALARY                               13           1 .076923077 NONE

Unwilling or incapable using GOOGLE
http://www.oracle-developer.com/oracle11g_multi_column_statistics.html
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_2092.htm#i1590494

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