The national visa of “D” category is granted to the certain individuals who are to be studying , working or permanently residing in one of the Schengen countries. The national visa can be of a single entry, granted for the people who are in need of residing in the Schengen country for a certain period of time and for a sole purpose after which they shall return to their country. On the other hand a multi-entry national visa is also granted for certain individuals allowing its holder to travel in and out of this Schengen country as he/she pleases and also travel throughout the whole Schengen Area without additional visa requirements.