Direct marketing involves direct communication with customers through various channels like direct mail, telemarketing, catalogs, and the internet to solicit a response or sale. Factors that contributed to its growth include the rise in credit card usage, changing family structures, and technological advances enabling better communication and delivery. Direct marketing combines with other marketing activities and utilizes customer databases to personalize communications. While it offers control, flexibility and measurable results, it also faces challenges with costs, delivery delays, and potential negative perceptions.