Basically VARRAY is varying array type that is typically used when the number of instances to be stored is small that means if we have one customer and this customer have number of phone numbers in our case if we know exact how many phone number he has so we will use VARRAY otherwise we will go for using nested tables.
You can use VARRAY data type for:

1. A column in a relational table
2. A PL/SQL variable
3. A PL/SQL parameter of procedure or function
4. A PL/SQL function return type
5. A data attribute of an object type

Now We can use VARRAY for a fixed-size array

declare
   type array_t is varray(3) of varchar2(10);
   array array_t := array_t('Matt', 'Joanne', 'Robert');
begin
   for i in 1..array.count loop
       dbms_output.put_line(array(i));
   end loop;
end;

Or TABLE for an unbounded array like:

type array_t is table of varchar2(10);

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