Organizational change involves moving an organization from its current state to a desired future state to increase effectiveness. It targets improvements at four levels: human resources, functional resources, technological capabilities, and organizational capabilities. There are two main types of change - evolutionary, which is gradual and incremental, and revolutionary, which is sudden and drastic. Managing change involves understanding the forces for and resisting change, and using techniques like action research, organizational development, and addressing resistance and promoting acceptance of change.