Illinois Inter-Departmental Communication (IDC) is a method of communication between different departments within an organization. It can be used to share important information and documents, coordinate tasks and activities, and collaborate on projects. IDC can be conducted through various strategies, including email, web conferences, instant messaging, and video conferencing. It is an effective way for departments to work together to maximize efficiency and productivity. Types of Illinois Inter-Departmental Communication include: email, web conferences, instant messaging, video conferencing, webinars, and teleconferencing.