For short-term stays of up to 90 days in any 180-day period, a Type C visa is required. You may do business, attend study programs, visit friends/relatives, engage in cultural or sporting activities, and so on with a Type C visa.
Depending on your reasons for visiting the Schengen Region and the frequency of your visits, the Schengen Consulate can issue you a 90-day single, double, or multiple-entry visa.