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"Use" expression makes the declaraitons usable according to the choices.

use library_name.package_name.object;
use library_name.package_name;
use library_name.package_name.all;



library IEEE;
use IEEE.Std_Logic_1164.all; -- All declarations in IEEE.Std_Logic_1164 package can be visible.

library IEEE;
use IEEE.Std_Logic_1164.Std_ulogic;   -- Std_ulogic type will be used by Rising_edge function.
use IEEE.Std_Logic_1164.Rising_edge; -- Rising_edge funcion becomes visible.








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