table type in DATA definition

Usually, I use TYPES to define structure and use DATA xxx type standard table of  a certain type defined before.

But when I optimize some old programs, the previous programmer wrote sth like:

DATA: BEGIN OF tab_g_item OCCURS 0,

     maktx   LIKE  makt-maktx,       "

     fkimg   LIKE  vbrp-fkimg,           "

END OF tab_g_item.

So what kind of table ' tab_g_item' is? Is it a standard table? what if I want to make it a sorted table?