PL/SQL is derived from Ada, which was originally designed for US Department of Defense by "Ada Lovelace". Main idea to use Ada was to capitalize on Idea of STANDARD package, so that needs not be used with dot notation every time we want to use it. Oracle adopted it and created two default packages STANDARD and DBMS_STANDRD and these are the only standard packages available in Oracle, even users cannot define their own default standard packages unlike Ada.
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