For a stay for up to three months (90 days), you might need a 'short-stay visa' (in Dutch: 'Visum Kort Verblijf', VKV), depending on your nationality.
This visa is also called a ‘Schengen visa’.
With a multiple entry short stay visa you are allowed to travel in and out of the Netherlands during the validity of your visa. During this period, you are also free to travel through the Schengen countries and back and forth to your home country or country of residence.
With a single entry short stay visa you are also allowed to travel in and out of the Netherlands and the other Schengen countries, but once you have left the Schengen area you can not return without a new Schengen visa. If there are good reasons, you can change your single entry visa to a muliptle entry visa.
If you want to change your visa you will need to make an appointment with the Immigration and Naturalisation Service of the Dutch Government (IND). In some cases a VKV might only be valid for one or a few Schengen countries. If that is the case you are only allowed to travel through the countries mentioned on your visa.
