NEED WHY WE USE REFRESH,FREE

I NEED CLEAR EXPLANATION
WHY I NEED TO USE REFRESH,FREE IN INTERNAL-TABLES.

hi..
CLEAR <itab>.
statement. This statement restores an internal table to the state it was in immediately after you declared it. This means that the table contains no lines. However, the memory already occupied by the memory up until you cleared it remains allocated to the table.
If you are using internal tables with header lines, remember that the header line and the body of the table have the same name. If you want to address the body of the table in a comparison, you must place two brackets ([ ]) after the table name.
CLEAR <itab>[].
To ensure that the table itself has been initialized, you can use the
REFRESH <itab>.
statement. This always applies to the body of the table. As with the CLEAR statement, the memory used by the table before you initialized it remains allocated. To release the memory space, use the statement
refresh should use only internal table,clear - you can use variables,internal table ,work areas
FREE : it is deallocating meomry
<b>Reward points if useful</b>
Regards
Ashu

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