DRTV generally bypasses traditional retail stores to make a product sale directly with the consumer, but can also be used to drive product sales at retail. DRTV is comprised of three primary marketing subgroups of short form, long form and live home shopping.
Persia/Persian is more or less synonymous with Iran/Iranian. Persia is just the older name whereas Iran is the country's modern name. I think people from Iran call themselves Persian because of Iran's negative image in the west since the 1979 revolution.
Indeed the word is Vedic/Avestan and the word Iran means land of the Aryans or land of the honorable people, now this honorable people were most probably neither a tribe nor a race, it was just something the early Indo Europeans who settled in Iran liked to call themselves.