What are Private procedure / functions in a Package ?

A function or procedure in a package which is not declared in package specification, its called as private function / procedure.

Scope of private function /procedure is very limited - on the package itself only.

While in declaring the private procedure/function in package, need to take care that it must be declare first in package declaration part of the package.

create or replace package pack_p1 is
    procedure proc_1;
end pack_p1;

create or replace package body pack_p1 is

    procedure test_proc_1 is
    begin
        dbms_output.put_line('package pack_p1 private procedure');
    end test_proc_1;

    function func_1 is
    begin
        dbms_output.put_line('package pack_p1 private function');
    end func_1;

    procedure proc_1 is
    begin
        dbms_output.put_line('package pack_p1 - proc 1');
        test_proc_1;
    end proc_1;

end pack_p1;