Telemarketing is a practice that rose to prominence in the 1970s. It includes contacting, vetting, and reaching out to potential customers. Businesses can initiate phone calls from offices, hire call centers, or telemarketers can do it from their homes now because of the changing work practices. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.