The process of sharing information and knowledge between extension workers and farmers is best described as communication. Communication is the overarching process that involves exchanging ideas, information, or skills through various channels (e.g., demonstrations, meetings, or media). While education (option 1) is a broader goal that may result from communication, it is not the specific process of sharing. Technology transfer (option 3) is a specialized form of communication focused on disseminating new technologies, not all information exchange. Farming (option 4) refers to agricultural practices, not the act of sharing knowledge. Thus, option (2) is correct, as communication is the core process in extension work.