There are four main visa categories that you can apply for - A, B, C and D. Type A is a transit visa where citizens of non-Schengen states are allowed to transit through or wait for their connecting flight at the airport located in the Schengen country. Type B visa is for short journey in the country that lasts for less than five days. Type C visa is a short stay visa that allows you to stay in the Schengen area for less than 90 days over a period of 180 days. This category of visa is further divided into single entry visa, double entry visa and multiple entry visa. Type D visa is for a long stay in the country and is mandatory for people who are willing to work, study or live in the Schengen country for longer than 90 days.