Robin Dhawan from K.L.S.D. College in Ludhiana presented on co-marketing communication. Co-marketing communication involves using various channels like newsletters, websites, email, and written materials to stay connected with customers and convey important company information. It allows companies to take advantage of economies of scale, preserve existing markets, create new markets, and gain expertise. Potential downsides include lack of common mission, lack of commitment between partners, barriers to entry and exit, and high costs of group decision making. Ultimately, co-marketing is a practice where companies cooperate on distribution and sometimes profit sharing.