Answer:
Contingency planning is an all-encompassing term meaning making preparations for uncertain future situations (i.e. what we do is literally contingent - depends upon - the situation that actually unfolds). It comprises a suite of techniques designed to identify and minimise risks, largely by preparing for the unexpected. Contingency planning concepts apply to business, IT, political, personal and other situations. Air bags in a car are an example of a contingency measure, while specifying and mandating the use of air bags demonstrates contingency planning.
Routine management planning: means preparing to keep the business by identifying risks. Critical business processes are identified and arrangements made to ensure any associated IT services, suppliers etc. are sufficiently resilient and/or have effective Disaster Recovery plans. Critical functions/processes with the IT department typically include IT and network operations plus help/service desk: these typically deserve their own continuity plans.