Anonymous procedure is a procedure without any name. If you have some variables to declare, you can define an anonymous procedure by using the DECLARE keyword in SQL*Plus as shown in the following tutorial script:

SQL> set serveroutput on;

SQL> declare

2 site char(80) := 'globalguideline';

3 begin

4 dbms_output.put_line('Welcome to ' || site);

5 end;

6 /

Welcome to globalguideline

PL/SQL procedure successfully completed.

SQL> /

Welcome to globalguideline

PL/SQL procedure successfully completed.

"/" runs the anonymous block, which print the "Welcome to globalguideline" message.