Can you help me to understand the difference between PLSQL_EXEC_TIME and ELAPSED_TIME in v$sqlarea

Hi,

I would like to understand what it is the difference between the column PLSQL_EXEC_TIME and ELAPSED_TIME, for example in my database I could gather the following values:

SQL> select PLSQL_EXEC_TIME,CPU_TIME, ELAPSED_TIME from v$sqlarea where sql_id='9dfqafknxuwk0'

PLSQL_EXEC_TIME         CPU_TIME               ELAPSED_TIME

----------------                     ----------------                ----------------

   4.721.206.289.994        18.520.873.588.044   18.906.904.039.607

Why the PLSQL_EXEC_TIME it is lower than the ELAPSED_TIME?

ELAPSED_TIME it is the portion of the DBTime contributed by this SQLID?

Regards