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.
Persian is a West Iranian language of the Indo-European family of languages and is spoken in those parts of Iran where the Fars people, Persians, dwell, as well as in the Republic of Tajikistan. Tehran, Isfahan, Fars, Khorasan, Kerman and Yazd are some of the provinces inhabited by the Persians.