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.
The Persian Empire was created by nomadic Persians who originally referred to themselves as parsua. The name Persia is a Greek and Latin pronunciation of the name Parsua, referring to people originating from Persis (or in Persian, Pars), their home territory located north of the Persian Gulf in south western Iran.