Explain the usage of type record, with datatype of the records as associative array

Ex:
type ty_1 is table of number index by plsql_integer;
type ty_2 is table of varchar2(10) index by plsql_integer;
type ty_3 is table of date index by plsql_integer;
TYPE rec_tab IS RECORD ( l_num ty_1, l_str ty_2, l_date ty_3);

Please explain this with an example having loops

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