what is the difference between like line of and type....

Hi all

can any body explain the difference between

DATA : t_caufv TYPE STANDARD TABLE OF caufv,

<b> wa_caufv LIKE LINE OF t_caufv.</b>

<b>( and ) </b>

DATA: it_aufk TYPE TABLE OF t_aufk,

<b> wa_aufk TYPE t_aufk.</b>

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