The Schengen Visa in image
In practical terms, a Schengen Visa is a secured label sticked on a page of a passport.
It allows the holder to enter in the 24 Schengen States for a uninterrupted stay
- on a one entry visa or for several consecutive stays
- on a multiple Entry Visa which total term cannot exceed 3 months per semester from the date of first entry.
More information on Wikipedia